📚 KS3 WJEC Science: Summer Preparation and Bridging Course | KS3 WJEC 科学：暑期预习与衔接课程
Summer is the perfect time to build confidence in science and prepare for the challenges of KS3 under the WJEC curriculum. This bridging course introduces you to key ideas in biology, chemistry and physics, as well as the essential skills of scientific enquiry. You will learn how scientists work, explore laboratory safety and discover the foundational concepts that underpin science lessons in Years 7, 8 and 9.
暑期是建立科学自信、为 WJEC 课程下的 KS3 挑战做好准备的最佳时机。本衔接课程将带你熟悉生物、化学和物理的核心概念，以及科学探究的关键技能。你将了解科学家如何工作，接触实验室安全规范，并探索支撑 7、8、9 年级科学课的基础知识。
1. What is KS3 Science under WJEC? | 什么是 WJEC KS3 科学？
The WJEC KS3 science curriculum is designed for learners in Wales and follows a broad, balanced approach to biology, chemistry and physics. It places a strong emphasis on practical work, scientific thinking and the application of knowledge to real-world contexts.
WJEC KS3 科学课程为威尔士学生设计，对生物、化学和物理学采取广泛而均衡的教学方法。它高度重视实验操作、科学思维以及知识在真实情境中的应用。
Key topics are delivered across three years, progressing from simple observations to more abstract reasoning. You will also develop skills in planning investigations, recording data and evaluating evidence – all of which form the backbone of the WJEC approach.
关键主题在三年中螺旋式递进，从简单观察到抽象推理。你还将培养设计探究、记录数据和评价证据的能力，这些正是 WJEC 科学教学的核心。
2. Scientific Enquiry: How Scientists Work | 科学探究：科学家如何工作
Scientific enquiry is about asking questions, making predictions and testing them through fair experiments. In WJEC science, you will learn to identify variables – the independent variable you change, the dependent variable you measure and the control variables you keep the same.
科学探究就是提出问题、作出预测并通过公平实验加以检验。在 WJEC 科学课中，你将学习识别变量——你改变的自变量、你测量的因变量，以及保持不变的受控变量。
You will also practice writing a clear hypothesis, which is a testable statement often starting with ‘If… then…’. Recording results accurately in tables and spotting patterns are crucial steps before drawing conclusions and evaluating whether the evidence supports your hypothesis.
你还会练习撰写清晰假设，这是一种可测试的陈述，常以“如果……那么……”开头。在推导结论并评价证据是否支持假设之前，准确地用表格记录结果并发现规律是关键步骤。
A full investigation ends with an evaluation, where you reflect on the reliability of your data, identify possible errors and suggest improvements. These skills will help you think like a scientist and are assessed throughout KS3.
完整的探究以评价收尾，你要反思数据的可靠性，识别可能的误差并提出改进建议。这些技能帮助你像科学家一样思考，并且贯穿 KS3 的评价过程。
3. Laboratory Safety and Equipment | 实验室安全与器材
Before any practical work, you must know how to work safely in a laboratory. Always wear safety goggles when heating substances or using chemicals. Tie back long hair, tuck in loose clothing and never run or eat in the lab.
进行任何实验操作之前，你必须知道如何在实验室安全地工作。加热物质或使用化学品时，始终佩戴防护目镜。长发要束好，宽松衣物塞紧，严禁在实验室奔跑或进食。
Hazard symbols such as corrosive, flammable and toxic help you identify risks on containers. Learn to use common apparatus correctly: a Bunsen burner for heating, a thermometer to measure temperature, a measuring cylinder for volumes of liquids and a microscope to view tiny specimens.
腐蚀性、易燃、有毒等危险符号帮助你识别容器上的风险。学会正确使用常见器材：本生灯用于加热，温度计测量温度，量筒量取液体体积，显微镜观察微小标本。
In the WJEC lab, you will also use a stopwatch, a balance and a clamp stand. Always check that glassware is not cracked and report any breakages to your teacher immediately. Safety is the first experiment every time.
在 WJEC 实验室里，你还会用到秒表、天平和铁架台。务必检查玻璃器皿有无裂缝，任何破损都要立即报告老师。每一次实验，安全都是第一步。
4. Cells – The Building Blocks of Life | 细胞——生命的基石
All living things are made of cells. Animal cells have a nucleus that contains genetic material, cytoplasm where chemical reactions happen, a cell membrane that controls what enters and leaves, and mitochondria for energy release.
所有生物都由细胞构成。动物细胞有储存遗传物质的细胞核、发生化学反应的细胞质、控制物质进出的细胞膜，以及释放能量的线粒体。
Plant cells have the same basic parts plus a rigid cell wall made of cellulose, a large permanent vacuole filled with cell sap, and chloroplasts that absorb light for photosynthesis. Using a microscope, you can observe these structures in onion skin or pondweed.
植物细胞除具有相同的基本结构外，还有由纤维素构成的坚硬细胞壁、充满细胞液的大液泡，以及吸收光能进行光合作用的叶绿体。使用显微镜，你可以观察洋葱表皮或水绵的这些结构。
Cells become specialised to perform particular functions. For example, red blood cells have no nucleus to carry more oxygen, and root hair cells have long extensions to absorb water. This specialisation is a key concept in WJEC biology.
细胞会特化以行使特定功能。例如，红细胞没有细胞核以便携带更多氧气，根毛细胞有长长的突起以吸收水分。细胞特化是 WJEC 生物学的重要概念。
5. States of Matter and Particle Theory | 物质状态与粒子理论
All substances are made of tiny particles that are constantly moving. The energy of these particles and the forces between them determine whether the substance is a solid, liquid or gas. This is the particle model used throughout WJEC chemistry.
所有物质都由不断运动的微小粒子构成。粒子的能量以及它们之间的作用力决定了物质是固体、液体还是气体。这就是贯穿 WJEC 化学的粒子模型。
In a solid, particles are held tightly in a fixed, regular pattern and can only vibrate. A solid keeps its own shape and cannot be compressed. In a liquid, particles are close but can slide past each other, so the liquid takes the shape of its container and has a fixed volume.
在固体中，粒子被牢牢固定在规则排列中，只能振动。固体保持自身形状且不能被压缩。液体中，粒子紧密但能相互滑动，因此液体具有固定体积却随容器形状而变。
In a gas, particles are far apart and move rapidly in all directions. A gas has no fixed shape or volume and can be compressed easily. The changes of state – melting, freezing, boiling, condensing and sublimation – can all be explained by changes in particle energy.
气体中，粒子相距很远并快速向四面八方运动。气体没有固定形状和体积，且容易被压缩。物质状态的变化——熔化、凝固、沸腾、凝结和升华——都可以用粒子能量的变化来解释。
The particle model helps to understand diffusion and gas pressure. Heated particles gain energy and spread out faster. Learning this model early makes later topics like chemical reactions much easier.
粒子模型有助于理解扩散和气体压强。受热粒子获得能量，扩散更快。及早掌握这个模型会使后续的化学反应等课题容易得多。
6. Energy Transfers and Stores | 能量传递与储存
Energy cannot be created or destroyed, only transferred from one store to another. WJEC KS3 introduces energy stores such as kinetic, thermal, chemical, gravitational potential and elastic potential. You learn to identify how energy is shifted when a process happens.
能量既不能被创造也不能被消灭，只能在不同储存之间传递。WJEC KS3 介绍了动能、热能、化学能、重力势能和弹性势能等能量储存。你要学会识别在某一过程中能量如何转移。
For example, when you switch on a lamp, energy is transferred electrically from the mains, then by light and heating. In a catapult, elastic potential energy stored in the stretched band becomes kinetic energy of the projectile. Sankey diagrams are used to show energy transfers visually.
例如，当你接通台灯，能量从电源通过电的途径传递，然后以光和热的形式散出。弹弓中，拉伸的橡皮筋储存的弹性势能转变为投射物的动能。桑基图用于直观地表示能量传递。
As you progress, you will calculate the energy needed to change temperature using the equation:
ΔE = m c Δθ
Here, ΔE is the change in thermal energy, m the mass, c the specific heat capacity and Δθ the temperature change. This prepares you for quantitative work in Year 9 and beyond.
随着学习深入，你将用下列公式计算改变温度所需的能量：
ΔE = m c Δθ
其中，ΔE 是热能变化，m 为质量，c 为比热容，Δθ 为温度变化。这为你在 9 年级及以后的定量学习做好准备。
7. Forces and Motion | 力与运动
Forces are pushes or pulls that can change an object’s speed, direction or shape. In WJEC science you will study contact forces like friction, air resistance and tension, as well as non-contact forces such as gravity, magnetism and electrostatic force.
力是能改变物体速度、方向或形状的推或拉。在 WJEC 科学中，你将学习摩擦力、空气阻力、张力等接触力，以及重力、磁力和静电力等非接触力。
An object stays stationary or moves at a constant speed when forces are balanced. When forces are unbalanced, the object accelerates or decelerates. You will draw force arrows on diagrams to show the size and direction of forces, with a longer arrow meaning a greater force.
当力平衡时，物体保持静止或匀速运动。力不平衡时，物体会加速或减速。你将在图上画出表示力的大小和方向的箭头，箭头越长表示力越大。
Speed is found by distance divided by time:
v = d / t
Velocity is speed in a given direction. Understanding the relationship between force, mass and acceleration is introduced qualitatively, often with trolleys and pulleys.
速度可由距离除以时间求得：
v = d / t
速度加上方向就是速度矢量。力、质量和加速度之间的关系通过小车与滑轮的实验初步定性引入。
8. Acids and Alkalis | 酸与碱
Acids and alkalis are chemical opposites. WJEC introduces common laboratory acids like hydrochloric acid (HCl), sulfuric acid (H₂SO₄) and nitric acid (HNO₃). Alkalis include sodium hydroxide (NaOH) and calcium hydroxide (Ca(OH)₂).
酸和碱是化学对立物。WJEC 引入了实验室常见的酸，如盐酸 (HCl)、硫酸 (H₂SO₄) 和硝酸 (HNO₃)。常见的碱包括氢氧化钠 (NaOH) 和氢氧化钙 (Ca(OH)₂)。
The pH scale runs from 0 to 14: values below 7 are acidic, 7 is neutral and above 7 are alkaline. Indicators, such as litmus and universal indicator, change colour to reveal the pH. An acid turns blue litmus red; an alkali turns red litmus blue.
pH 标度从 0 到 14：小于 7 为酸性，7 为中性，大于 7 为碱性。指示剂如石蕊和通用指示剂通过颜色变化揭示 pH。酸使蓝色石蕊试纸变红，碱使红色石蕊试纸变蓝。
When an acid reacts with an alkali, a neutralisation reaction takes place, producing a salt and water:
acid + alkali → salt + water
Example: HCl + NaOH → NaCl + H₂O. Neutralisation is common in everyday life, from treating indigestion to adjusting soil pH.
酸与碱发生中和反应，生成盐和水：
酸 + 碱 → 盐 + 水
实例：HCl + NaOH → NaCl + H₂O。中和反应在日常生活中很常见，从治疗消化不良到调节土壤 pH 值均是如此。
9. The Periodic Table and Elements | 元素周期表与元素
All substances are made from about one hundred types of atom called elements. The Periodic Table arranges these elements in order of atomic number into rows and columns. Metals appear on the left and centre, while non-metals are on the right.
所有物质都由大约一百种称为元素的原子构成。元素周期表按原子序数将元素排列成行和列。金属位于左侧和中部，非金属位于右侧。
Elements in the same group (vertical column) have similar chemical properties. Group 1 contains the highly reactive alkali metals, Group 7 the halogens, and Group 0 the unreactive noble gases. You will learn to use the table to predict reactivity and bonding.
同一族（竖列）的元素具有相似的化学性质。第 1 族是高活性碱金属，第 7 族是卤素，第 0 族是惰性的稀有气体。你将学会利用周期表预测反应活性和化学键。
Compounds form when two or more elements chemically combine. A formula shows the ratio of atoms, e.g. CO₂ (one carbon and two oxygens). You will practise reading and writing simple chemical formulae in WJEC chemistry.
当两种或多种元素通过化学方式结合就形成了化合物。化学式表示原子的比例，例如 CO₂（一个碳原子和两个氧原子）。在 WJEC 化学课中，你会练习读写简单的化学式。
10. Reproduction and Variation | 生殖与变异
Reproduction is essential for the continuation of a species. In KS3 you will study both sexual reproduction, which involves two parents and produces genetically varied offspring, and asexual reproduction, where one parent produces identical clones.
繁殖对物种延续至关重要。在 KS3 你将学习有性生殖（涉及两个亲本并产生遗传上不同的后代）和无性生殖（一个亲本产生完全相同的克隆）。
In flowering plants, sexual reproduction involves pollination, fertilisation and seed dispersal. The male gamete (pollen) fuses with the female gamete (ovule) inside the ovary. In humans, sperm and egg cells meet, leading to the development of an embryo.
在有花植物中，有性生殖包括授粉、受精和种子传播。雄配子（花粉）与雌配子（胚珠）在子房内融合。人类体内，精子与卵细胞相遇，继而发育成胚胎。
Variation within a species can be continuous (e.g. height) or discontinuous (e.g. eye colour). Differences arise from genetic information and the environment. A bridging course introduces these concepts so you are ready for more detailed topics like evolution and inheritance.
一个物种内的变异可以是连续的（如身高）或不连续的（如眼色）。差异源自遗传信息和环境。衔接课程引入这些概念，为你学习进化和遗传等更详细的主题做好准备。
11. Electricity and Magnetism | 电与磁
Understanding electricity starts with building simple circuits. You will use symbols for cells, batteries, switches, bulbs and buzzers. In a series circuit, the current is the same everywhere. In a parallel circuit, the current splits at junctions.
理解电要从搭建简单电路开始。你将使用电池、开关、灯泡和蜂鸣器的电路符号。串联电路中，各处电流相等；并联电路中，电流在节点处分流。
Current is the flow of electric charge, measured in amperes (A), while voltage is the energy transferred per unit charge, measured in volts (V). Resistance, measured in ohms (Ω), opposes the flow. These quantities are linked by Ohm’s law, often introduced qualitatively in KS3.
电流是电荷的流动，单位为安培 (A)；电压是每单位电荷转移的能量，单位为伏特 (V)。电阻的单位为欧姆 (Ω)，它阻碍电流流动。这些量通过欧姆定律联系起来，在 KS3 通常以定性方式引入。
Magnetism complements electricity. A bar magnet has north and south poles; like poles repel, unlike poles attract. An electromagnet can be made by winding a coil of wire around an iron core and passing a current through it. Electromagnets are used in relays, bells and motors.
磁学与电学相辅相成。条形磁铁有 N 极和 S 极；同极相斥，异极相吸。电磁铁可通过在铁芯上缠绕线圈并通入电流来制作。电磁铁用于继电器、电铃和电动机中。
12. Bridging the Gap: Effective Study Tips | 衔接学习：有效的学习方法
To make the most of your summer bridging course, establish a routine. Spend short, focused sessions on each science topic rather than cramming. Use the WJEC glossaries to learn key terms before the term begins – this builds your scientific vocabulary and reduces anxiety.
为了充分利用暑期衔接课程，建立规律的学习节奏。用短而专心的板块学习每一科学主题，而不是临时突击。在学期开始前利用 WJEC 术语表学习关键术语，这能积累你的科学词汇量并减少焦虑。
Draw diagrams and mind maps to connect ideas. For biology, sketch and label cells; for chemistry, colour-code the Periodic Table; for physics, draw force diagrams. Explaining a concept to a friend or family member is also an excellent way to check your understanding.
绘制示意图和思维导图以连接各知识点。生物方面，画细胞并标注；化学方面，给周期表涂色编码；物理方面，画受力图。向朋友或家人解释某个概念也是检验你理解程度的绝佳方式。
Finally, practise basic mathematical skills used in science: rearranging simple formulas, converting units and plotting graphs. All these skills will be called upon in WJEC practical assessments. A little preparation in the summer can give you a confident start.
最后，练习科学中用到的数学基本技能：简单公式变形、单位换算和绘制图表。所有这些技能都将在 WJEC 实验测评中需要。暑期稍作准备，就能让你自信地开启新学年。
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