📚 Year 7 WJEC Engineering: Transition Guide | 七年级 WJEC 工程:升学衔接指南
Moving from primary school to Year 7 is an exciting step, especially when you begin to study engineering as part of the WJEC curriculum. This transition guide will help you understand what to expect, how to build on your existing skills and how to thrive in your first year of secondary engineering. Whether you have already built models at home or are completely new to the subject, the key is curiosity and a willingness to solve problems. The WJEC approach to engineering at Key Stage 3 is all about designing, making and evaluating. You will work with different materials, learn to use basic tools safely, and explore how engineering shapes the world around us. This article will walk you through the most important aspects of the Year 7 engineering journey, giving you practical tips and a clear overview of the subject.
从小学升入七年级是一个令人兴奋的阶段,尤其是当你开始在 WJEC 课程体系中学习工程学。这份衔接指南将帮助你了解学习内容、如何发挥已有技能,并在中学第一年的工程课上大放异彩。无论你是在家已经搭过模型,还是对这个学科完全陌生,关键都在于保持好奇心和解决问题的意愿。WJEC 在关键阶段三的工程课程重点在于设计、制作和评估。你将接触不同的材料,学习安全使用基本工具,并探索工程如何塑造我们身边的世界。本文将带你了解七年级工程学习中最核心的内容,给你提供实用的建议和清晰的学科概览。
1. What Is Engineering in Year 7? | 七年级工程学是什么?
In Year 7, engineering is not just about fixing things or wearing a hard hat. It is a creative subject where you learn to identify real-world problems and design solutions. You will combine knowledge from science, mathematics and design technology to make products that work. Typical Year 7 projects might include building a simple catapult, designing a wind-powered vehicle or creating a mechanical greeting card. The WJEC syllabus encourages you to think like an engineer: ask questions, sketch ideas, build prototypes and test them. You will also keep a design portfolio to record your thoughts, drawings and reflections. This portfolio is an important part of your assessment and helps you track your progress throughout the year.
在七年级,工程学不只是修理东西或戴着安全帽。它是一门充满创造力的学科,你要学会发现现实世界中的问题并设计解决方案。你将结合科学、数学和设计技术的知识来制作能实际运作的产品。典型的七年级项目可能包括搭建一个简易投石机、设计一辆风力驱动小车,或者制作一张机械贺卡。WJEC 大纲鼓励你用工程师的思维去思考:提出问题、画草图、制作原型并进行测试。你还需要维护一本设计档案,记录自己的想法、图纸和反思。这本档案是评估的重要组成部分,也能帮你追踪一整年的学习进展。
The subject is taught in a workshop or a design classroom, often with a mix of hands-on activity and theory. You might spend one lesson learning about forces and structures, and the next lesson building a bridge out of spaghetti that must hold a certain weight. Engineering at this stage is very practical, so you will be on your feet, working with materials like wood, plastic, card and sometimes basic electronic components. The aim is to make you comfortable with the idea that failure is part of learning – if your first bridge collapses, you learn why and make it stronger.
这门课通常在工作坊或设计教室里进行,既有动手实践也有理论学习。也许一节课你在学习力和结构的知识,下一节课你就用意大利面条搭建一座必须承重的桥。这个阶段的工程学非常注重实践,因此你会经常站着操作,接触木材、塑料、卡纸,有时也会用到基本的电子元件。课程的目标是让你坦然接受失败是学习的一部分——如果你的第一座桥塌了,你会弄清楚原因,然后把它造得更坚固。
2. Building on Your Primary School Skills | 在小学技能基础上提升
You already bring valuable skills from primary school, even if you have never studied engineering before. Subjects like science and mathematics give you a strong foundation. In KS2 science, you may have investigated forces, magnets, materials and basic electricity – all of which will be used in Year 7 engineering projects. Your experience with design and technology in primary school, such as making pop-up cards or simple structures, also prepares you for more advanced making tasks. Do not worry if your previous school did not offer much practical work; teachers in Year 7 will start with the basics and make sure everyone can use tools safely.
即使你以前从未学过工程学,你也已经从小学带来了宝贵的技能。科学和数学等学科为你打下了坚实的基础。在 KS2 科学中,你可能已经研究过力、磁铁、材料和基础电学——所有这些知识都会用在七年级的工程项目中。你在小学的设计与制作经历,比如制作立体贺卡或简单结构,也为你完成更复杂的制作任务做好了准备。如果你之前所在的学校没有太多实践操作,也不用担心;七年级的老师会从基础教起,确保每个人都能安全使用工具。
Your ability to work in a team and to follow instructions is just as important. During primary school, you learned to share resources, listen to others and explain your ideas. These soft skills are essential in engineering lessons because you will often work in pairs or small groups to build and test models. Being able to describe what you are doing and why is a key part of the design process, and you will be encouraged to use correct technical vocabulary from the very start. A positive attitude and a willingness to try again after a setback will take you far in this subject.
你在团队合作和遵守指令方面的能力同样重要。在小学期间,你学会了分享资源、倾听他人和解释自己的观点。这些软技能在工程课上至关重要,因为你经常会与同伴或小组成员一起建造和测试模型。能够描述你正在做什么以及为什么这样做,是设计过程的关键部分,而且从一开始老师就会鼓励你使用正确的技术词汇。积极的心态和在挫折后愿意再次尝试的精神,会让你在这门学科中走得更远。
3. Key Concepts and Terminology | 关键概念与术语
Engineers use a special set of words to describe their work, and you will quickly become familiar with them. Terms like ‘specification’, ‘design brief’, ‘prototype’ and ‘evaluation’ will be part of your everyday vocabulary. A specification is a list of requirements that a product must meet. A design brief is a short statement that explains the problem you are solving. A prototype is an early model of your product built to test ideas. Evaluation means looking back at what you have made and deciding how it could be improved. Understanding these words early will help you follow lessons and complete written tasks with confidence.
工程师使用一套专门的词汇来描述他们的工作,你很快就能熟悉这些词汇。“规格说明”、“设计简介”、“原型”和“评估”等术语将成为你日常词汇的一部分。规格说明是产品必须满足的一系列要求。设计简介是一份简短陈述,解释你要解决的问题。原型是为了测试想法而制作的早期产品模型。评估则意味着回顾你制作的产品,并决定如何改进它。尽早理解这些词语将帮助你跟上课程并自信地完成书面任务。
In addition to process words, you will learn about material properties such as ‘hardness’, ‘toughness’, ‘flexibility’ and ‘conductivity’. For example, a material that is tough can absorb impact without breaking, while a flexible material can bend without snapping. You might use a table like the one below to compare materials for a specific project. You will also encounter basic mechanical terms: a lever is a simple machine that pivots on a fulcrum; a gear is a wheel with teeth that transmits motion. Building this technical vocabulary now will support your learning in science and design technology too.
除了过程词汇,你还会学到材料性质,比如“硬度”、“韧性”、“柔韧性”和“导电性”。例如,韧性材料可以吸收冲击力而不会断裂,而柔韧材料可以弯曲而不会折断。你可能会使用下面这样的表格,为特定项目比较材料。你还会遇到基本的力学词汇:杠杆是绕支点转动的简单机械;齿轮是带齿并传递运动的轮子。现在就建立这些技术词汇库,对你将来学习科学和设计技术也很有帮助。
| English Term | 中文术语 | Meaning / 含义 |
|---|---|---|
| Specification | 规格说明 | A list of what a product must do / 产品必须做到的事项清单 |
| Prototype | 原型 | A first working model for testing / 用于测试的第一个工作模型 |
| Fulcrum | 支点 | The pivot point of a lever / 杠杆的转动点 |
4. The Engineering Design Process | 工程设计流程
At the heart of every project is the engineering design process. This is a step-by-step cycle that helps you move from a problem to a finished product. In Year 7, the process is usually broken down into five stages: Research, Design, Make, Test, Evaluate. You begin by researching the problem and looking at existing products. Then you sketch several design ideas and choose one to develop. Next, you plan the making stage, list the materials and tools you will need, and build your prototype. Once built, you test it against the specification and collect results. Finally, you evaluate the whole project, writing about what went well and what could be better.
每个项目的核心都是工程设计流程。这是一个循序渐进的周期,帮助你从问题走向成品。在七年级,这个流程通常分为五个阶段:调研、设计、制作、测试、评估。首先你要调研问题,并观察现有的产品。然后你画出多个设计草图,并选择一个进行深入。接着,你规划制作阶段,列出所需的材料和工具,并搭建原型。完成制作后,你要对照规格进行测试,收集结果。最后,你评估整个项目,写下哪些地方做得好,哪些可以改进。
You will often find that engineers go through this cycle more than once. After testing your prototype, you might spot a weakness and go back to the design stage to improve it. This is called iteration, and it is a normal part of engineering. Your teacher will show you how to record each stage in your design portfolio, using notes, photographs and annotated sketches. Being systematic in your approach is more important than getting everything right the first time. Real engineers rarely get it perfect straight away, and neither will you – and that is absolutely fine.
你会发现工程师经常不止一次地经历这个循环。测试完原型后,你可能发现一个弱点,然后回到设计阶段进行改进。这叫做迭代,是工程学中的正常环节。老师会教你如何在设计档案中用笔记、照片和带注释的草图记录每个阶段。采用系统化的方法比一次性把所有事情都做对更重要。真正的工程师很少能一次就达到完美,你也不会——而这完全没问题。
5. Health and Safety in the Workshop | 工作坊中的健康与安全
Before you touch any tool or machine, you must understand the workshop safety rules. Your school will have a clear set of guidelines that you need to follow at all times. Always wear personal protective equipment (PPE) such as safety glasses, aprons and sometimes gloves. Tie back long hair, remove loose jewellery and tuck in ties or scarves. Never run in the workshop; always walk and be aware of people around you. Listen carefully when the teacher demonstrates how to use a new tool, and ask for permission before you start using any equipment. In WJEC engineering lessons, safety is not an optional extra – it is a habit you build from day one.
在你接触任何工具或机器之前,你必须了解工作坊安全规则。学校会有一套明确的指南,你需要始终遵守。务必穿戴个人防护装备(PPE),例如护目镜、围裙,有时还要戴手套。把长发扎好,摘掉宽松的首饰,并将领带或围巾塞好。绝对不要在工作坊里奔跑;始终步行并留意周围的人。在老师演示如何使用新工具时认真听讲,并在开始使用任何设备前获得允许。在 WJEC 的工程课上,安全不是可选项——而是从第一天起就要养成的习惯。
You will learn how to handle tools like junior hacksaws, bench hooks, hot glue guns and soldering irons (with close supervision). Each tool has its own safety rules. For example, when using a craft knife, always cut away from your body and use a cutting mat. When drilling, make sure the material is clamped securely. A clean and tidy workspace is also part of safety – put tools back in their proper places and sweep up sawdust or offcuts. If an accident does happen, however minor, you must tell the teacher immediately. By respecting the rules, you make the workshop a safe place for everyone to create and learn.
你将学习如何安全使用中小型钢锯、木工台钳、热熔胶枪,并在密切监督下使用电烙铁。每种工具都有自己的安全规则。例如,使用美工刀时,要始终朝远离身体的方向切割,并垫上切割垫。钻孔时,要确保材料被牢牢夹紧。保持工作区整洁也是安全的一部分——把工具放回原处,清理锯末或边角料。如果确实发生了事故,无论多轻微,都必须立即告诉老师。尊重规则,你就能让工作坊成为每个人都能创造和学习的场所。
6. Tools and Equipment You Will Use | 你将使用的工具与设备
In Year 7, you will gradually build up your skills with a range of workshop tools. Hand tools are the starting point. These include rulers, try squares, marking gauges, tenon saws, coping saws, rasps and files. You will learn to measure accurately and mark out your materials before cutting. Measuring twice and cutting once is a golden rule. For joining materials, you may use PVA wood glue, hot glue guns or simple mechanical fasteners such as screws and nails. As you progress, you might use strip heaters to bend plastic or vacuum formers to shape it. All tools will be introduced with a safety demonstration first.
在七年级,你会逐步掌握一系列工作坊工具的使用技能。手工具是起点,包括直尺、直角尺、划线规、夹背锯、钢丝锯、木锉和锉刀。你会学习准确测量材料,并在切割前做好标记。二次测量一次切割是黄金法则。在连接材料时,你会用到白乳胶、热熔胶枪,或者螺丝、钉子等简单的机械连接件。随着学习的深入,你还可能使用热弯机来弯曲塑料,或用真空吸塑机来成型。所有工具都会通过安全演示进行介绍。
You will also be introduced to some simple machines, like a pillar drill or a scroll saw, under close teacher guidance. Pillar drills make clean, straight holes in wood, plastic or soft metal. Scroll saws allow you to cut curved shapes with precision. In electronics projects, you might use a soldering iron to join components onto a circuit board. Remember that every workshop is different, but the core skills you develop – measuring, cutting, shaping, joining and finishing – are universal. By the end of the year, you will feel much more confident using tools to turn your ideas into reality.
在老师密切指导下,你还会接触一些简单机械,比如台钻或曲线锯。台钻可以在木材、塑料或软金属上打出干净、垂直的孔。曲线锯则能让你精确地切割曲线形状。在电子项目中,你可能会用电烙铁将元件焊接到电路板上。请记住,每个工作坊的设备不尽相同,但你培养的核心技能——测量、切割、成型、连接和表面处理——是通用的。到学年结束时,你会对自己使用工具将创意变成现实的能力充满信心。
7. Mathematics for Young Engineers | 小工程师需要的数学
Mathematics is a tool that helps engineers design accurately and check whether a structure will work. In Year 7, you will use maths in practical ways almost every lesson. You need to measure lengths in millimetres and centimetres, calculate areas and perimeters, and sometimes work out volumes. For example, if you are making a wooden box, you need to calculate the surface area of the wood required. If you are building a glider, you might measure the wing span and work out the ratio between the wing and the body. All these activities strengthen your number skills without feeling like a typical maths lesson.
数学是帮助工程师精确设计并检验结构是否可行的工具。在七年级,几乎每节课你都会以实践的方式运用数学。你需要以毫米和厘米为单位测量长度,计算面积和周长,有时还要算出体积。例如,如果你在制作一个木盒子,就需要计算所需木材的表面积。如果你在制作一架滑翔机,可能要测量翼展,并计算机翼与机身的比例。所有这些活动都能强化你的数字技能,而且感觉不像传统的数学课。
You will also use graphs and charts to present test results. If you test how much weight a bridge can hold before breaking, you can plot the data on a bar chart or line graph. You might use simple equations, such as the formula for speed
speed = distance ÷ time
when testing a balloon-powered car. Understanding units is vital – always write down whether your measurement is in grams, newtons, metres per second or another unit. Your teacher will help you build these mathematical skills, and you will discover that engineering gives maths a clear, real-world purpose.
你还会使用图表来展示测试结果。如果你测试一座桥在断裂前能承受多大重量,可以用条形图或折线图绘制数据。在测试气球动力小车时,你可能会用到简单的公式,比如速度公式
速度 = 距离 ÷ 时间
。理解单位至关重要——始终要记下你的测量值是以克、牛顿、米每秒还是其他单位表示。老师会帮助你掌握这些数学技能,而你也会发现工程学给了数学一个清晰的现实目标。
8. Science Links: Forces, Materials, and Energy | 科学联系:力、材料与能源
Engineering and science go hand in hand. In Year 7, your science lessons will support your engineering projects directly. When you learn about forces in science – pushes, pulls, gravity and friction – you can apply this to making structures that are strong and stable. Understanding tension and compression helps you design better bridges and towers. The concept of moments (turning forces) can be introduced simply with levers. A seesaw is a great example: effort × distance from fulcrum = load × distance from fulcrum. You might not need to calculate it yet, but seeing it in action builds intuition.
工程与科学密不可分。在七年级,你的科学课将直接支持你的工程项目。当你在科学课上学到力——拉力、推力、重力和摩擦力——你就可以把这些知识用在制造坚固稳定的结构上。理解拉伸和压缩有助于你设计出更好的桥梁和塔楼。力矩(转动力)的概念可以通过杠杆简单引入。跷跷板就是一个很好的例子:作用力 × 力臂 = 载荷 × 载荷臂。你现在也许还不需要计算它,但亲身观察能建立直觉。
Material properties are another powerful link. In science you might test materials to see if they are conductors or insulators of electricity and heat. In engineering, you use this knowledge to choose the right material – a plastic handle for a tool because it insulates heat, or copper wire because it conducts electricity well. Energy is also central: when you design a wind turbine model, you are converting kinetic energy from wind into electrical energy (even if it just lights an LED). These connections make both science and engineering more meaningful, so pay attention in science lessons – the knowledge is directly transferable.
材料性质是另一个强有力的联系。在科学课上,你可能会测试材料是电和热的导体还是绝缘体。在工程学中,你运用这些知识来选择合适的材料——工具的手柄用塑料,因为它隔热;电线用铜,因为它导电性好。能源同样处于核心位置:当你设计风力涡轮机模型时,你实际上是将风中的动能转化为电能(即使它只能点亮一个 LED 灯)。这些联系让科学和工程都更有意义,所以请重视科学课——这些知识是直接可迁移的。
9. Communication Skills: Sketching and Annotating | 沟通技能:草图与标注
Engineers must be able to communicate their ideas clearly, and drawing is an essential skill. In Year 7, you will learn how to create freehand sketches in 2D and simple 3D drawings such as isometric or oblique projections. Do not worry if you do not think you are good at art – engineering sketches are about showing how something works, not about being a beautiful painting. You will use pencils and fineliners to draw neat outlines, adding notes (annotations) that explain your choices. An annotation might say ‘Fillet added for extra strength’ or ‘Hole drilled here to reduce weight’. These labels show that you are thinking like an engineer.
工程师必须能够清晰地表达自己的想法,绘图就是一项基本技能。在七年级,你会学习徒手绘制二维草图以及简单的三维图,比如等轴测图或斜二测图。如果你觉得自己不擅长艺术,不必担心——工程草图在于展示物体的工作原理,而不是画成一幅美丽的画。你会使用铅笔和针管笔画出清晰的轮廓,并添加注释(标注)来解释你的设计选择。一个标注可能写着“增加圆角以提高强度”或者“在此钻孔以减轻重量”。这些标签显示出你正在像工程师一样思考。
You will also use technical drawing tools like compasses, protractors and set squares to create accurate plans. Being able to draw to scale is important; for instance, you might decide that 1 cm on paper represents 10 cm in real life. This helps you plan the exact size of your project before you cut any material. Digital skills are becoming part of engineering communication too. Some schools introduce simple CAD (Computer-Aided Design) software, where you can draw 3D models on screen. Whether on paper or screen, your drawings are a vital step in turning an idea into a built reality.
你还会使用圆规、量角器和三角板等绘图工具来制作精确的图样。能够按比例绘图很重要;例如,你可能决定纸上 1 厘米代表实际 10 厘米。这有助于你在切割任何材料之前规划项目的精确尺寸。数字技能也正成为工程交流的一部分。有些学校会介绍简单的 CAD(计算机辅助设计)软件,让你在屏幕上绘制三维模型。无论是在纸上还是在屏幕上,你的图纸都是将创意转化为实物的关键步骤。
10. Working in Teams and Presenting Ideas | 团队合作与展示想法
Many engineering projects in Year 7 are collaborative. You might work with a partner to design a bridge or be part of a small team building a solar oven. Working well with others means listening to different ideas, sharing the workload and solving disagreements respectfully. You will often be given roles, such as ‘materials manager’, ‘designer’ or ‘tester’. Rotating these roles helps you develop a range of skills. Good teamwork speeds up the making process and often leads to more creative solutions. It is also a lot more fun to celebrate a successful prototype when you have built it together.
许多七年级的工程项目需要合作。你可能和搭档一起设计一座桥,或作为小团队的一员建造一个太阳能烤箱。与他人良好合作意味着倾听不同的想法、分担工作量,并以尊重的态度解决分歧。老师常常会给你们分配角色,比如“材料管理员”、“设计师”或“测试员”。轮换这些角色有助于你发展多种技能。良好的团队合作能加快制作过程,并常常催生更有创意的解决方案。当你和团队一起完成一个成功的原型时,庆祝起来也会有趣得多。
At the end of a project, you may be asked to present your work to the class. This can feel a bit scary, but it is a valuable skill. A short presentation might include what your design brief was, how you built the prototype, your test results and what you would do differently next time. Use your completed model or portfolio to help explain your points. Speak clearly and be ready to answer questions. Your classmates and teacher will be interested in your journey, not just the final outcome. Presentations help everyone learn from each other and prepare you for a future where communicating technical ideas is essential.
在项目结束时,你可能会被要求向全班展示你的作品。这可能让你有点紧张,但这是一项宝贵的技能。一个简短的展示可能包括你的设计简介是什么、你是如何搭建原型的、测试结果如何,以及你下次会做哪些改进。用你完成的模型或档案来帮助解释你的观点。说话要清晰,并准备好回答问题。你的同学和老师感兴趣的是你的探索历程,而不仅仅是最终成果。展示能让大家互相学习,并为你未来在一个必须交流技术想法的环境做准备。
11. Assessment in WJEC Engineering | WJEC 工程评估方式
Your progress in Year 7 engineering will be assessed in several ways that reflect the design process. Most of your grade comes from your design portfolio and the practical outcomes of your projects. The portfolio should show evidence of research, initial sketches, developed ideas, planning, making and evaluation. Your teacher will look for clear annotation and evidence that you have tested and refined your ideas. The quality of your finished product – how well it works, how neat the finish is – also matters, but the journey is just as important as the destination. In WJEC engineering, you are rewarded for showing how you think and problem-solve.
你在七年级工程学中的进步将通过多种方式评估,这些方式反映了设计流程。你的成绩大部分来自于设计档案和项目实践成果。档案应展示调研、初步草图、深化设计、计划、制作和评价的证据。老师会寻找清晰的注释以及你测试和改进想法的证据。你成品的质量——它运作得如何、表面处理有多整洁——也很重要,但过程与结果同等重要。在 WJEC 工程学中,你展示自己如何思考和解决问题的过程会得到认可。
There may also be short written tasks or quizzes that check your understanding of key terms and concepts. These are nothing to worry about if you review your notes regularly. Some schools use success criteria or a simple rubric, often split into bands such as ‘Developing’, ‘Secure’ and ‘Extended’. To do well, always follow the design brief, meet the specification points, and include a thorough evaluation that honestly says what worked and what could be improved. Your teacher will give you verbal and written feedback after each project, so you will always know your next steps.
可能还会有简短的书面作业或小测验,来检查你对关键术语和概念的理解。如果你定期复习笔记,这些不用担心。一些学校会使用成功标准或简单的评分量规,常分为“发展中”、“稳固”和“拓展”等层级。要想表现出色,就要始终遵循设计简介,达到规格要点,并包含一份全面的评估,诚实地说明哪些部分有效、哪些可以改进。在每个项目结束后,老师会给你口头和书面的反馈,因此你始终清楚自己下一步该做什么。
12. Tips for a Successful Transition | 顺利过渡的小贴士
Starting engineering in Year 7 is a fantastic opportunity, and a little preparation can make it even more enjoyable. First, get into the habit of observing the designed world around you. Notice how furniture is joined, why playground equipment is shaped a certain way, or how packaging protects fragile items. This builds your design awareness. Second, practise drawing and measuring at home. Simple activities like sketching a chair or measuring ingredients for cooking can sharpen your skills. Third, stay organised – keep your portfolio neat, label your drawings and always note the dates of your work. Organisation saves time and reduces stress.
在七年级开始学习工程学是一个绝佳的机会,而小小的准备能让它更有乐趣。首先,养成观察身边人造世界的习惯。注意家具是如何连接的,游乐设施为什么是某个形状,或者包装是如何保护易碎物品的。这能培养你的设计意识。其次,在家练习绘图和测量。一些简单的活动,比如给椅子画速写或烹饪时称量食材,都能提升你的技能。第三,保持条理——让你的档案整洁,给图纸标注,并始终记下工作日期。有条理能节约时间并减轻压力。
Fourth, do not be afraid to make mistakes. Every broken joint or wobbly tower teaches you something valuable. Write down your mistakes and what you learned from them – this makes your evaluation stronger. Fifth, ask questions. If you do not understand a term or a technique, put your hand up. The workshop is a place of learning, and your teacher wants to help you succeed. Sixth, practise working with others outside school: help a sibling build a model or do a puzzle together. These experiences develop patience and communication. Finally, enjoy the creativity. Engineering lets you turn imagination into something you can touch and test, and that is a very special feeling.
第四,不要害怕犯错。每一个断开的接头或摇晃的塔都在教你宝贵的东西。记下你的
Published by TutorHao | Year 7 工程 Revision Series | aleveler.com
更多咨询请联系16621398022(同微信)
屏轩国际教育cambridge primary/secondary checkpoint, cat4, ukiset,ukcat,igcse,alevel,PAT,STEP,MAT, ibdp,ap,ssat,sat,sat2课程辅导,国外大学本科硕士研究生博士课程论文辅导