📚 Year 8 WJEC Science: Summer Revision & Bridging Course | Year 8 WJEC 科学：暑期预习与衔接课程
Welcome to your summer science bridging programme, designed to consolidate your Year 8 WJEC knowledge and prepare you for the challenges of Year 9. This course revisits the core concepts from biology, chemistry and physics that you have covered during the year, making sure your understanding is solid before you move on. By working through each topic, you will strengthen your scientific vocabulary, improve your practical reasoning, and build confidence with the key ideas that underpin the next stage of your studies. Whether you found some topics tricky or simply want to review thoroughly, this guide will support your revision with clear explanations and bilingual notes to help your learning.
欢迎来到暑期科学衔接课程，本课程旨在巩固你八年级 WJEC 的知识，并为九年级的挑战做好准备。课程回顾了你在这一年中学习过的生物、化学和物理核心概念，确保你在进入更高年级之前基础牢固。通过每个主题的学习，你将加强科学词汇、提高实验推理能力，并建立对关键概念的信心，这些概念是下一阶段学习的基础。无论你是否觉得某些主题有点棘手，或者只是想彻底复习，这份指南都会用清晰的解释和中英双语笔记来支持你的复习。
1. Introduction to Cells and Microscopy | 细胞与显微技术入门
All living organisms are made up of cells, which are the basic building blocks of life. In Year 8, you learned to identify the main parts of animal and plant cells using a light microscope. Key structures include the nucleus, cytoplasm, cell membrane, mitochondria and, in plant cells, the cell wall, vacuole and chloroplasts. Understanding the function of each organelle helps explain how cells carry out life processes such as respiration and photosynthesis.
所有生物体都由细胞构成，细胞是生命的基本组成单位。在八年级，你学会了使用光学显微镜识别动植物细胞的主要部分。关键结构包括细胞核、细胞质、细胞膜、线粒体，以及植物细胞特有的细胞壁、液泡和叶绿体。理解每个细胞器的功能有助于解释细胞如何进行呼吸作用和光合作用等生命过程。
mis. Remember that total magnification is calculated by multiplying the eyepiece lens magnification (usually ×10) by the objective lens magnification (e.g. ×4, ×10 or ×40). Accurate drawing and labelling of what you see under the microscope is an essential skill that will be built upon in Year 9, where you will study specialised cells in greater detail.
你还练习了使用显微镜观察装片，有时还会自己制作口腔上皮细胞或洋葱表皮细胞的临时装片。记住，总放大倍数等于目镜放大倍数（通常为×10）乘以物镜放大倍数（例如×4、×10或×40）。准确地绘制并标注你在显微镜下看到的图像是一项基本技能，九年级将在此基础上更详细地学习特化细胞。
2. States of Matter and Particle Theory | 物质状态与粒子理论
The particle model is one of the most powerful ideas in science. It describes how all matter is made of tiny particles that are constantly moving. The three common states of matter – solid, liquid and gas – can be explained by how these particles are arranged and how much energy they have. In a solid, particles are held in a fixed, regular pattern and only vibrate; in a liquid, they are close together but can move past each other; in a gas, particles are far apart and move rapidly in all directions.
粒子模型是科学中最强大的概念之一。它描述了所有物质都是由不断运动的微小粒子组成的。物质常见的三种状态——固态、液态和气态——可以通过粒子的排列方式和它们所具有的能量来解释。在固体中，粒子被固定在规则的排列中，只能振动；在液体中，粒子紧密接触但可以相互滑动；在气体中，粒子相距很远，并向各个方向快速运动。
Changes of state, such as melting, freezing, boiling and condensing, can be understood in terms of energy transfer. When a solid is heated, particles gain energy and vibrate more vigorously until they can break free from their fixed positions – this is melting. The reverse happens during freezing. The particle model also helps explain why mass is conserved during changes of state: the number of particles stays the same, only their arrangement and motion change.
状态变化，例如熔化、凝固、沸腾和凝结，可以用能量传递来解释。当固体受热时，粒子获得能量并振动得更剧烈，直到能够挣脱固定的位置——这就是熔化。凝固则是相反的过程。粒子模型还有助于解释为什么在状态变化过程中质量守恒：粒子的数量保持不变，改变的只是它们的排列方式和运动状态。
3. Forces and Motion | 力与运动
In Year 8, you explored how forces can change the speed, direction or shape of an object. A force is a push or a pull, measured in newtons (N). When forces on an object are balanced, the object remains at rest or moves at a constant speed in a straight line. Unbalanced forces cause an object to accelerate or decelerate. You also learned to represent forces using arrow diagrams, where the length of the arrow shows the magnitude and the direction shows the direction of the force.
在八年级，你探索了力如何改变物体的速度、方向或形状。力是推或拉，以牛顿（N）为单位。当作用在物体上的力平衡时，物体保持静止或沿直线匀速运动。不平衡的力则使物体加速或减速。你还学习了用箭头图示表示力，箭头的长度表示力的大小，箭头的指向表示力的方向。
Friction is a force that opposes motion between two surfaces in contact. It can be useful, such as when walking or braking a bicycle, but can also be reduced by using lubricants or streamlining. Gravity is another key force, pulling objects towards the centre of the Earth. The weight of an object is the force of gravity acting on its mass, and it can be calculated using the formula:
摩擦力是一种阻碍接触表面之间相对运动的力。它有时是有用的，例如在行走或自行车刹车时，但也可以通过使用润滑剂或流线型设计来减小。重力是另一种关键的力，它将物体拉向地球的中心。物体的重量是作用在其质量上的重力，可以用以下公式计算：
Weight (N) = mass (kg) × gravitational field strength (N/kg), W = m × g
重量（N）= 质量（kg）× 引力场强度（N/kg），W = m × g
On Earth, g is approximately 10 N/kg, so a 5 kg object has a weight of roughly 50 N. Understanding this relationship is fundamental for Year 9 topics such as moments and pressure.
在地球上，g 大约为 10 N/kg，所以一个 5 kg 的物体重量约为 50 N。理解这一关系对于九年级的力矩和压强等主题至关重要。
4. Energy Transfers and Stores | 能量传递与储存
Energy is not created or destroyed; it is transferred between stores. In Year 8, you identified different energy stores, including kinetic, thermal, chemical, gravitational potential, elastic potential, and nuclear energy. Devices and processes transfer energy from one store to another. For example, when a ball is dropped, energy is transferred from the gravitational potential store to the kinetic store.
能量既不会凭空产生也不会凭空消失，它是在不同的储存方式之间传递的。在八年级，你认识了不同的能量储存方式，包括动能、热能、化学能、重力势能、弹性势能和核能。各种设备和过程会将能量从一种储存方式传递到另一种。例如，当球下落时，能量从重力势能储存传递到动能储存。
Energy can be transferred by heating, by doing work (when a force moves an object), by electric currents, or by waves such as sound and light. Sankey diagrams are used to visualise energy transfers, showing useful energy outputs and wasted energy. Wasted energy is often dissipated as thermal energy into the surroundings, which is why efficiency is always less than 100 % in real systems.
能量可以通过加热、做功（当力移动物体时）、通过电流，或通过声波和光波等波进行传递。桑基图用于直观展示能量传递过程，显示有用的能量输出和被浪费的能量。浪费的能量通常以热能的形式耗散到周围环境中，这就是为什么在真实系统中效率总是低于 100% 的原因。
A key equation memorised during Year 8 is the efficiency calculation:
八年级需要记住的一个关键方程式是效率计算：
Efficiency = (useful energy output ÷ total energy input) × 100%
效率 =（有用的能量输出 ÷ 总能量输入）× 100%
Being comfortable with this concept will help when you study power and energy resources in Year 9.
熟练掌握这一概念将有助于你在九年级学习功率和能源资源时更加得心应手。
5. Chemical Reactions and Equations | 化学反应与方程式
Chemical reactions are processes in which atoms are rearranged to form new substances. In Year 8, you observed signs of a chemical reaction, such as colour change, production of a gas (bubbles), temperature change, or formation of a precipitate. A simple word equation can represent a reaction, showing the reactants (starting substances) on the left and the products on the right, joined by an arrow.
化学反应是原子重新排列形成新物质的过程。在八年级，你观察了化学反应的迹象，例如颜色变化、产生气体（气泡）、温度变化或生成沉淀。一个简单的文字方程式可以表示一个反应，左侧写反应物（起始物质），右侧写生成物，中间用箭头连接。
For example, the combustion of methane in oxygen can be written as:
例如，甲烷在氧气中的燃烧可以写作：
methane + oxygen → carbon dioxide + water
甲烷 + 氧气 → 二氧化碳 + 水
You also learned that mass is conserved during a chemical reaction. In Year 9, you will move on to symbol equations and balancing them, so it is important to be confident identifying reactants and products from a description. Practising the naming of compounds using simple rules (e.g. sodium chloride for NaCl, copper oxide for CuO) will also give you a head start.
你还学到了在化学反应中质量是守恒的。到了九年级，你将学习符号方程式并配平它们，因此能够根据描述识别反应物和生成物非常重要。练习使用简单规则命名化合物（例如 NaCl 为氯化钠，CuO 为氧化铜）也能让你领先一步。
6. Acids and Alkalis | 酸与碱
Acids and alkalis are groups of chemicals with characteristic properties. Acids have a sour taste (though you should never taste chemicals in the lab) and turn blue litmus paper red. Common laboratory acids include hydrochloric acid, sulfuric acid and nitric acid. Alkalis are soluble bases; they feel soapy and turn red litmus paper blue. Examples include sodium hydroxide and potassium hydroxide.
酸和碱是两类具有特征性质的化学品。酸有酸味（虽然在实验室中绝不应品尝化学品），并能使蓝色石蕊试纸变红。常见的实验室酸包括盐酸、硫酸和硝酸。碱是可溶的氢氧化物，它们有滑腻感，能使红色石蕊试纸变蓝。例子包括氢氧化钠和氢氧化钾。
The pH scale, ranging from 0 to 14, is used to measure how acidic or alkaline a solution is. A pH below 7 indicates an acid (the lower the number, the stronger the acid), pH 7 is neutral (pure water), and a pH above 7 indicates an alkali. Neutralisation is the reaction between an acid and an alkali that produces a salt and water. A general word equation is:
pH 值的范围是 0 到 14，用于衡量溶液的酸碱度。pH 值低于 7 表示酸性（数值越低酸性越强），pH 值等于 7 为中性（纯水），pH 值高于 7 表示碱性。中和反应是酸和碱之间的反应，产生盐和水。通用的文字方程式为：
acid + alkali → salt + water
酸 + 碱 → 盐 + 水
Year 9 will extend this to the concept of ions and the reactivity series, so a clear memory of pH indicators, the names of common acids and alkalis, and the products of neutralisation will be very helpful.
九年级将引申到离子和金属活动性顺序的概念，因此清楚记住 pH 指示剂、常见酸和碱的名称以及中和反应的产物，将对你大有帮助。
7. Ecosystems and Interdependence | 生态系统与相互依存
An ecosystem is a community of living organisms interacting with each other and their non‑living environment. In Year 8, you studied food chains and food webs to show feeding relationships. Producers (usually green plants) make their own food by photosynthesis, while consumers eat other organisms. Decomposers, such as bacteria and fungi, break down dead material and recycle nutrients.
生态系统是生物群落与它们所处的非生物环境相互作用的一个整体。在八年级，你学习了用食物链和食物网来表示捕食关系。生产者（通常是绿色植物）通过光合作用自己制造食物，而消费者则吃其他生物。分解者，如细菌和真菌，分解死去的物质并回收营养物质。
The arrow in a food chain shows the direction of energy transfer: from the organism being eaten to the feeder. You also looked at how changes in one population can affect others – for instance, if a predator is removed, the prey population may increase, leading to overgrazing and then a crash. This interdependence means that organisms rely on each other for survival.
食物链中的箭头表示能量传递的方向：从被吃的生物指向取食者。你还观察到一个种群的变化如何影响其他种群——例如，如果一种捕食者被移除，猎物种群可能会增加，导致过度啃食植被然后数量锐减。这种相互依存意味着生物体彼此依赖以生存。
Adaptations are features that help organisms survive in their habitat. In Year 9, you will explore natural selection and evolution, so understanding adaptations and competition will give you a strong foundation.
适应性是指有助于生物在其栖息地生存的特征。在九年级，你将探索自然选择和进化，因此理解适应性和竞争将为你奠定坚实的基础。
8. Electricity and Circuits | 电与电路
Electric circuits are built from components such as cells, bulbs, switches and resistors. You learned to use circuit symbols to draw diagrams and to construct series and parallel circuits. In a series circuit, all the components are connected in a single loop. The current is the same everywhere, but the potential difference (voltage) is shared between the components. If one bulb breaks, the circuit is broken and all the bulbs go out.
电路由诸如电池、灯泡、开关和电阻器等元件构成。你学会了使用电路符号绘制电路图，并搭建串联和并联电路。在串联电路中，所有元件都连接在一个单一的回路中。各处电流相同，但电势差（电压）在元件之间分配。如果一个灯泡损坏，电路就会断开，所有灯泡都会熄灭。
In a parallel circuit, each component is on its own branch. The current from the cell splits between the branches, and the potential difference across each branch is the same as the cell’s voltage. If one loop breaks, the other loops keep working, which is why parallel circuits are used in household wiring. The relationship between current, voltage and resistance is introduced conceptually in Year 8 and will be formalised as Ohm’s law in Year 9:
在并联电路中，每个元件都在自己的支路上。来自电池的电流会在各支路之间分配，而每条支路两端的电势差与电池的电压相等。如果一条支路断开，其他支路仍能继续工作，这就是为什么家用电路采用并联方式。在八年级时，电流、电压和电阻之间的关系是作为概念引入的，到九年级时将正式学习为欧姆定律：
V = I × R (voltage = current × resistance)
V = I × R（电压 = 电流 × 电阻）
Reviewing how to measure current with an ammeter and voltage with a voltmeter will be especially useful.
复习如何使用电流表测量电流和如何使用电压表测量电压，将会特别有帮助。
9. Sound and Light Waves | 声波与光波
Waves transfer energy without transferring matter. In Year 8, you studied sound and light as examples of waves. Sound waves are longitudinal mechanical waves, which means particles vibrate parallel to the direction of energy transfer and they need a medium (solid, liquid or gas) to travel through. Light waves, on the other hand, are transverse electromagnetic waves that can travel through a vacuum.
波传递能量而不传递物质。在八年级，你学习了声波和光波作为波的例子。声波是纵波，属于机械波，这意味着粒子的振动方向与能量传递方向平行，并且它们需要介质（固体、液体或气体）才能传播。而光波是横波，属于电磁波，可以在真空中传播。
The speed of sound in air is about 340 m/s, while the speed of light is 300,000,000 m/s. This huge difference explains why you see lightning before you hear thunder. You also explored how sound can be reflected as an echo and how light can be reflected by mirrors and refracted when it passes between different transparent materials.
声音在空气中的速度约为 340 m/s，而光速为 300,000,000 m/s。这一巨大的差异解释了为什么你会先看到闪电后听到雷声。你还探索了声音如何反射成回声，以及光如何被镜面反射，以及在穿过不同透明材料时如何发生折射。
The basic law of reflection states that the angle of incidence equals the angle of reflection. Year 9 will extend these ideas into the electromagnetic spectrum and ray diagrams for lenses, so having a firm grasp of wave terminology – amplitude, frequency, wavelength – will be essential.
基本的反射定律指出，入射角等于反射角。九年级将把这些概念扩展到电磁波谱和透镜的光线图，因此牢固掌握波的术语——振幅、频率、波长——至关重要。
10. Earth’s Resources and the Environment | 地球资源与环境
Many of the materials we use every day come from the Earth’s crust, oceans and atmosphere. In Year 8, you considered renewable and non‑renewable resources. Fossil fuels such as coal, oil and natural gas are non‑renewable, as they take millions of years to form and are being used up much faster than they are created. Renewable resources, such as solar, wind and tidal energy, can be replenished on a human timescale.
我们日常使用的许多材料都来自地壳、海洋和大气。在八年级，你思考了可再生和不可再生资源。煤炭、石油和天然气等化石燃料是不可再生的，因为它们需要数百万年才能形成，而消耗的速度远快于生成的速度。可再生资源，如太阳能、风能和潮汐能，可以在人类的时间尺度内得到补充。
You also discussed the importance of recycling, both to conserve resources and to reduce the environmental damage caused by extraction and waste. The carbon cycle is another key idea: it describes how carbon moves between the atmosphere, living things and the oceans. Photosynthesis removes carbon dioxide from the air, while respiration and combustion return it.
你还讨论了回收利用的重要性，这既是为了节约资源，也是为了减少开采和废弃物对环境造成的破坏。碳循环是另一个关键概念：它描述了碳在大气、生物和海洋之间如何流动。光合作用从空气中移除二氧化碳，而呼吸作用和燃烧则将其归还。
Year 9 will introduce the greenhouse effect and climate change in more detail, so being confident with the carbon cycle and the difference between energy resources will put you in a strong position.
九年级将更详细地介绍温室效应和气候变化，因此熟练掌握碳循环以及能源资源之间的区别，将使你处于有利地位。
11. Practical Skills and Safety | 实验技能与安全
Science is a practical subject, and the skills you develop during investigations are just as important as the factual knowledge. In Year 8, you practised planning fair‑test investigations, where you change one independent variable, measure the dependent variable, and control all other factors. You also learned to record results in tables and to plot bar charts or line graphs, depending on the type of data.
科学是一门实践性学科，你在探究过程中培养的技能与事实知识同样重要。在八年级，你练习了设计公平实验，即改变一个自变量，测量因变量，并控制所有其他因素。你还学会了用表格记录结果，并根据数据类型绘制条形图或折线图。
Safety in the laboratory is always the top priority. You must be able to recognise hazard symbols (e.g. corrosive, flammable, toxic) and understand the precautions needed. For example, wearing safety goggles, tying back long hair, and never eating or drinking in the lab. Before starting any practical work, always read the risk assessment and follow your teacher’s instructions.
实验室安全始终是重中之重。你必须能够识别危险标志（例如腐蚀性、易燃、有毒），并理解所需的预防措施。例如，佩戴护目镜、将长发束起，绝不在实验室饮食。开始任何实验操作前，务必阅读风险评估并遵循老师的指示。
In Year 9, you will carry out more complex investigations, possibly using data loggers and computer modelling. Being tidy in your data collection and clear in your conclusions will help you access higher levels in assessments. Don’t forget the simple but powerful structure: method, results, conclusion, evaluation.
在九年级，你将进行更复杂的探究，可能会使用数据记录仪和计算机建模。整洁地收集数据和清晰地得出结论，将帮助你在评估中获得更高等级。不要忘记那个简单但有效的结构：方法、结果、结论、评估。
12. Bridging to Year 9: Key Concepts to Master | 衔接九年级：需掌握的关键概念
As you move from Year 8 to Year 9, the science curriculum builds directly on what you have already learned. Three big ideas stand out: particles, energy and cells. Almost every topic in physics, chemistry and biology can be linked back to these. If you understand the behaviour of particles, you can explain states of matter, density, diffusion and even chemical bonding later on. Energy is the universal currency; it flows through every system, from a simple circuit to a whole ecosystem.
当你从八年级升入九年级时，科学课程将直接建立在已学知识的基础上。三个核心大概念格外突出：粒子、能量和细胞。物理、化学和生物中的几乎每个主题都可以与它们联系起来。如果你理解粒子的行为，就能解释物态、密度、扩散，甚至以后的化学键。能量是通用的货币；它流经每一个系统，从简单的电路到整个生态系统。
Cells are the fundamental unit of life, and Year 9 will delve deeper into cell division, genetics and evolution. Making sure you can confidently describe the organelles of a cell, write a word equation for respiration and photosynthesis, and interpret a food web will save you stress when these topics become more mathematical and abstract.
细胞是生命的基本单位，九年级将更深入地研究细胞分裂、遗传学和进化。确保你能自信地描述细胞的各个细胞器，写出呼吸作用和光合作用的文字方程式，并解释食物网，这样当这些主题变得更数学化和抽象化时，你就不会感到吃力。
Finally, use this summer to practise the scientific method: ask questions, make predictions, and test ideas with simple experiments at home if it is safe to do so. Reading science news or watching educational videos in English can also boost your language skills while keeping your scientific mind sharp. Return to school in September ready to enjoy the next stage of your science journey.
最后，利用这个暑假练习科学方法：提出问题，做出预测，并在安全的前提下通过简单的家庭实验来检验想法。阅读科学新闻或观看英文教育视频，也可以在保持科学思维敏锐的同时提高语言能力。九月开学时，你将准备好享受科学旅程的下一阶段。
Published by TutorHao | Science Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
或截图后用「扫一扫 → 相册」选择本图