📚 Summer Preparation and Bridging Course for Year 7 CAIE Engineering | CAIE 7年级工程暑期预习与衔接课程
Engineering shapes the world we live in, from the smartphones in our pockets to the bridges that connect cities. This bridging course is designed for Year 7 students entering the CAIE curriculum to build a strong foundation in engineering concepts, practical skills, and the design process. By exploring topics over the summer, you will gain confidence, understand how things work, and be ready to tackle the exciting challenges of your engineering classes.
工程塑造了我们生活的世界，从口袋里的智能手机到连接城市的桥梁，无不渗透着工程的智慧。本衔接课程专为即将进入 CAIE 课程体系的 7 年级学生设计，旨在帮助大家建立工程概念、实践技能和设计流程方面的坚实基础。在暑期探索这些主题，你将获得自信，理解事物运作的原理，并为应对工程课上令人兴奋的挑战做好充分准备。
1. What is Engineering? | 什么是工程？
Engineering is the application of science and mathematics to solve real-world problems. Engineers design, build, and test structures, machines, electronic systems, and materials to improve people’s lives. There are many branches, such as civil, mechanical, electrical, and software engineering, but all share a common goal: creating solutions that are safe, efficient, and sustainable.
工程是应用科学和数学解决现实世界问题的学科。工程师设计、建造并测试结构、机器、电子系统和材料，以改善人们的生活。工程学有许多分支，如土木工程、机械工程、电子工程和软件工程，但它们都有一个共同的目标：创造安全、高效且可持续的解决方案。
2. The Engineering Design Process | 工程设计流程
The engineering design process is a step-by-step method engineers use to develop products and systems. The main stages are: Ask (define the problem), Imagine (brainstorm ideas), Plan (select the best solution and draw it), Create (build a prototype), and Improve (test, evaluate, and refine). This cycle can be repeated many times to make a design better.
工程设计流程是工程师开发产品和系统时所采用的循序渐进的方法。主要阶段包括：提问（定义问题）、想象（头脑风暴想法）、计划（选择最佳解决方案并绘制图纸）、创造（制作原型）和改进（测试、评估并优化）。这个循环可以重复多次，以使设计日臻完善。
A simple example: If you need a device to hold your phone upright while watching a video, you would first ask what requirements it must meet (stable, lightweight, adjustable). Then imagine different shapes, plan by sketching a design with measurements, create a model from cardboard, and test it. If it falls over, you improve the base.
一个简单的例子：如果你需要一个在观看视频时将手机竖直固定的装置，你先要提问它必须满足哪些要求（稳定、轻便、可调节）。然后想象不同的形状，计划时画出带尺寸的草图，用硬纸板制作模型并进行测试。如果它倒下了，你就改进底座。
3. Materials and Their Properties | 材料及其特性
Selecting the right material is crucial in engineering. Common materials include metals (steel, aluminium), plastics (acrylic, PVC), wood (pine, plywood), and composites (fibreglass). Each material has properties such as strength, hardness, flexibility, conductivity, and density. For instance, aluminium is light and corrosion-resistant, making it ideal for aircraft parts, while steel is very strong and used in building frames.
选择合适的材料在工程中至关重要。常见的材料包括金属（钢、铝）、塑料（亚克力、PVC）、木材（松木、胶合板）和复合材料（玻璃纤维）。每种材料都有强度、硬度、柔韧性、导电性和密度等特性。例如，铝质轻且耐腐蚀，非常适合用于飞机零件；而钢非常坚固，常用于建筑框架。
| Material | Key Property | 材料 | 关键特性 |
|---|---|---|---|
| Steel | High tensile strength, durable | 钢 | 抗拉强度高、耐用 |
| Copper | Excellent electrical conductivity | 铜 | 优良的导电性 |
| Acrylic | Transparent, lightweight, shatter-resistant | 亚克力 | 透明、轻质、不易碎 |
| Plywood | Layers glued for strength, reduces warping | 胶合板 | 多层胶合增强强度，减少翘曲 |
4. Simple Machines: Levers, Pulleys, and Gears | 简单机械：杠杆、滑轮与齿轮
Simple machines help us multiply force or change its direction. A lever consists of a rigid bar pivoting on a fulcrum. The mechanical advantage depends on the distances from the fulcrum to the effort and load. The basic equation is: Effort × Effort arm = Load × Load arm, or F₁ × d₁ = F₂ × d₂. If the effort arm is longer, less force is needed.
简单机械帮助我们放大力量或改变力的方向。杠杆由绕支点转动的刚性杆组成。其机械效益取决于施力点和负载到支点的距离。基本等式为：力 × 力臂 = 重物 × 重臂，即 F₁ × d₁ = F₂ × d₂。如果力臂更长，所需的力就更小。
A pulley can change the direction of an applied force and, when used in a system, can reduce the effort needed to lift a load. Gears transmit motion and can alter speed and torque: a small gear driving a larger gear increases torque but reduces speed.
滑轮可以改变施加力的方向，当组成滑轮组时，还能减少吊起重物所需的力。齿轮传递运动，并可改变速度和扭矩：小齿轮驱动大齿轮会增加扭矩但降低速度。
Mechanical advantage = Load ÷ Effort
机械效益 = 负载 ÷ 施力
5. Forces and Structural Stability | 力与结构稳定性
Forces such as tension, compression, torsion, and shear act on every structure. Understanding how to balance these forces ensures a building or bridge remains stable. Triangles are often used in frameworks because they distribute forces evenly and resist deformation. A truss bridge uses many triangles to support heavy loads.
拉力、压力、扭力和剪力等各种力作用在每一个结构上。理解如何平衡这些力能确保建筑物或桥梁的稳定。三角形经常用于框架结构，因为它们能均匀分布力并抵抗变形。桁架桥使用许多三角形来支撑重载荷。
Centre of gravity also plays a key role: the lower the centre of gravity, the more stable an object. That is why racing cars have a wide wheelbase and low body.
重心也起着关键作用：重心越低，物体越稳定。这就是为什么赛车拥有宽轮距和低车身。
6. Introduction to Basic Electronics | 基础电子学入门
Electronics forms the backbone of modern devices. A simple circuit requires a power source (battery), conductors (wires), a load (like an LED or motor), and often a switch. The flow of electric charge is called current (I), measured in amperes. Voltage (V) is the energy pushing the charge, and resistance (R) opposes the flow. Ohm’s law describes their relationship: V = I × R.
电子学是现代设备的骨干。一个简单的电路需要电源（电池）、导体（导线）、负载（如 LED 或马达），通常还有一个开关。电荷的流动称为电流（I），单位是安培。电压（V）是推动电荷的能量，电阻（R）则阻碍流动。欧姆定律描述了它们的关系：V = I × R。
You can start experimenting with a breadboard, battery pack, LEDs, and resistors. Always connect the longer leg (anode) of an LED to the positive side and use a resistor to limit current, or the LED may burn out.
你可以从面包板、电池组、LED 和电阻开始实验。务必把 LED 的长脚（阳极）接到正极，并使用电阻限制电流，否则 LED 可能会烧坏。
7. Technical Sketching and Drawing Conventions | 技术草图与绘图规范
Engineers communicate ideas through drawings. Freehand sketching helps to quickly visualise concepts, while formal technical drawings use rulers, set squares, and compasses. Isometric projection shows a 3D view where all three axes are equally foreshortened, giving a clear sense of depth. Orthographic projection uses multiple 2D views (front, top, side) to show exact dimensions.
工程师通过图纸沟通想法。徒手草图有助于快速将概念可视化，而正式的技术图纸则要使用直尺、三角尺和圆规。等轴测投影展示的是三条轴线均等缩短的三维视图，能清晰地体现深度。正交投影使用多个二维视图（前、俯、侧）来显示精确尺寸。
Always add labels, dimensions, and a title block. Lines must be crisp: use thick lines for outlines and thin lines for dimension and hidden details.
务必添加标签、尺寸和标题栏。线条必须清晰：使用粗实线绘制轮廓，细实线绘制尺寸线及隐藏细节。
8. Workshop Safety and Tool Use | 车间安全与工具使用
Safety is the number one priority in any engineering workshop. Always wear appropriate personal protective equipment (PPE): safety glasses, an apron, and closed-toe shoes. Tie back long hair, remove dangling jewellery, and follow instructions precisely when using machines like pillar drills or soldering irons.
安全是任何工程车间里的第一要务。始终佩戴适当的个人防护装备（PPE）：护目镜、工作围裙和包头鞋。将长发扎起，取下悬垂的首饰，并在使用台钻或烙铁等机器时严格遵守操作说明。
Basic tools you will use include a steel rule, try square, hacksaw, files, screwdrivers, and pliers. Learn to measure accurately in millimetres and check your cuts with a square to ensure edges are perpendicular.
你将使用的基本工具包括钢尺、直角尺、钢锯、锉刀、螺丝刀和钳子。学会以毫米为单位精确测量，并用直角尺检查切割处，确保边缘垂直。
9. Problem Solving and Creative Thinking | 问题解决与创意思维
Engineering is not just about following instructions; it is about thinking creatively to overcome challenges. Use techniques like brainstorming, SCAMPER (Substitute, Combine, Adapt, Modify, Put to another use, Eliminate, Reverse), and mind mapping to generate innovative ideas. Keep a design notebook where you record observations, sketches, and reflections.
工程不仅仅是遵循指令，更在于创造性地思考以克服挑战。使用头脑风暴、SCAMPER（替代、组合、调整、修改、另作他用、消除、反向）和思维导图等技巧来产生创新想法。准备一本设计笔记本，记录你的观察、草图与思考。
When a prototype fails, don’t get discouraged. Analyse what went wrong, identify the cause, and try a new approach. Thomas Edison famously said he found 10,000 ways that did not work before inventing a practical light bulb.
当原型失败时，不要气馁。分析出了什么问题，找出原因，然后尝试新的方法。托马斯·爱迪生有句名言：在发明实用的电灯泡之前，他找到了一万种行不通的方法。
10. Cross-Curricular Links: Maths and Science in Engineering | 跨学科联系：工程中的数学与科学
Engineering draws heavily on mathematics and physics. You will calculate areas and volumes for material estimation, use ratios and proportions for scaling models, and apply force equations to predict how structures will behave. For example, the stress on a column is force divided by cross-sectional area: Stress = F/A.
工程学大量运用数学和物理知识。你要计算面积和体积以估算材料用量，使用比例和比率缩放模型，并应用力方程式预测结构的行为。例如，柱子承受的应力等于力除以截面积：应力 = F/A。
Scientific concepts such as energy transfer, material properties, and electrical circuits are directly applied. When you study heat shrinking or thermal expansion, remember that materials expand when heated, which must be accounted for in bridges and railway tracks through expansion joints.
能量转换、材料特性和电路等科学概念会直接得到应用。当你学习热收缩或热膨胀时，请记住材料受热会膨胀，因此在桥梁和铁轨中必须使用伸缩缝以作补偿。
11. Summer Bridging Activities and Project Ideas | 暑期衔接活动与项目创意
To prepare for Year 7, try these hands-on activities: Build a spaghetti bridge and test how much weight it can hold; design a balloon-powered car; create a simple burglar alarm circuit with a buzzer and a switch made from aluminium foil; or construct a tower from paper straws that withstands a fan’s wind. Document your process using the design steps.
为 7 年级做准备，请尝试以下动手活动：搭建一座意面桥并测试其承重；设计一辆气球动力小车；制作一个简单的防盗报警电路，使用蜂鸣器和铝箔制成的开关；或用纸吸管搭建一座能经受风扇吹拂的塔。运用设计步骤记录整个过程。
Also, maintain an “engineering journal” this summer. Each day, observe objects around you—a zipper, a can opener, a folding chair—and sketch them, discussing how they work and what materials are used. This will sharpen your analytical skills.
此外，这个夏天请保持写“工程日志”。每天观察你周围的物品——拉链、开罐器、折叠椅——并画出草图，讨论它们的工作原理及使用了什么材料。这将锻炼你的分析能力。
12. Review Checklist and Next Steps | 复习清单与下一步
As you head into the new term, review the following key points: Can you explain the design process and give an example? Can you compare properties of three different materials? Do you know how a lever provides mechanical advantage? Can you draw a simple circuit diagram and apply Ohm’s law? Are you familiar with workshop safety rules and basic tool names?
在你进入新学期时，请回顾以下要点：你能解释设计流程并给出示例吗？你能比较三种不同材料的特性吗？你知道杠杆如何提供机械效益吗？你能画出简单的电路图并应用欧姆定律吗？你熟悉车间安全规定和基本工具的名称吗？
If you feel confident about these, you are well prepared. If not, revisit the sections above and try the activities again. The key to success in CAIE Engineering is staying curious, being systematic, and never being afraid to make improvements. Enjoy the journey of turning ideas into reality!
如果你对这些问题感到有信心，说明你已经准备充分了。如果还没有，请重温以上章节并再次尝试那些活动。在 CAIE 工程课程中取得成功的关键在于保持好奇心、做事有条理，并且从不害怕持续改进。祝你享受将想法变为现实的旅程！
Published by TutorHao | Engineering Revision Series | aleveler.com
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