📚 Year 8 CCEA Science: Vocabulary & Terminology Quick Memorisation Guide | 8年级CCEA科学：词汇术语速记指南
Mastering scientific vocabulary is the key to unlocking success in Year 8 CCEA Science. When you understand the 'language of science', concepts become clearer, experiments make more sense, and exam questions feel less intimidating. This guide breaks down the essential terminology from physics, chemistry, and biology into bite-sized, bilingual explanations to help you memorise them faster and remember them longer.
掌握科学词汇是在8年级CCEA科学中取得成功的关键。当你理解了“科学的语言”，概念会变得更清晰，实验会变得更有意义，考试题目也不再那么令人生畏。本指南将物理、化学和生物中的重要术语分解成简短的中英双语解释，帮助你更快记忆并长期保持。
1. Scientific Inquiry & Basic Terms | 科学探究与基本术语
Before diving into subject-specific words, you need a few general terms that appear in almost every investigation.
在深入了解各学科专用术语之前，你需要掌握一些几乎每次探究都会出现的通用术语。
A hypothesis is an educated prediction about what will happen in an experiment, based on prior knowledge.
假设是基于已有知识对实验中将要发生的现象做出的有根据的预测。
A variable is any factor that can be changed, controlled, or measured in an investigation. The independent variable is the one you change; the dependent variable is the one you measure.
变量是实验中能够被改变、控制或测量的任何因素。自变量是你改变的那个变量；因变量是你测量的那个变量。
An observation is information gathered using your senses or instruments. A conclusion is a summary that explains whether the results support the hypothesis.
观察是用感官或仪器收集的信息。结论是总结，说明结果是否支持假设。
A fair test is an investigation where only the independent variable is changed, and all others are kept constant.
公平测试是一种仅有自变量被改变、其他变量保持不变的探究方法。
2. Physical Quantities & Units | 物理量及单位
All measurements in science use standard units. These terms form the backbone of every physics topic.
科学中所有测量都使用标准单位。这些术语构成了每一个物理主题的支柱。
Mass is the amount of matter in an object, measured in kilograms (kg). Weight is the force of gravity on that mass, measured in newtons (N).
质量是物体所含物质的多少，以千克(kg)为单位。重量是作用在该质量上的重力，以牛顿(N)为单位。
Volume is the amount of space an object occupies, often measured in cubic metres (m³) or litres (L).
体积是物体占据的空间大小，通常以立方米(m³)或升(L)为单位。
a substance. It explains why some objects float and others sink. Density = mass ÷ volume.
密度是物质单位体积的质量。它解释了为什么有些物体会漂浮而有些会下沉。密度 = 质量 ÷ 体积。
Temperature is a measure of how hot or cold something is, measured in degrees Celsius (°C) or kelvin (K). Time is measured in seconds (s) and speed in metres per second (m/s).
温度是衡量物体冷热程度的量，以摄氏度(°C)或开尔文(K)为单位。时间以秒(s)为单位，速度以米每秒(m/s)为单位。
3. Forces & Motion | 力与运动
Forces cause objects to start moving, stop, change direction, or change shape. Recognising force types is essential.
力能使物体开始运动、停止、改变方向或改变形状。识别力的类型至关重要。
A force is a push or a pull, measured in newtons (N). A contact force acts when two objects touch, such as friction or tension.
力是推或拉，以牛顿(N)为单位。接触力在两个物体接触时产生，例如摩擦力或张力。
Friction is a force that opposes motion between two surfaces. Air resistance and water resistance are types of friction.
摩擦力是阻碍两个表面相对运动的力。空气阻力和水阻力都是摩擦力的类型。
Gravity is a non-contact force that attracts objects with mass towards each other. On Earth, it pulls everything towards the centre of the planet.
重力是一种非接触力，它将具有质量的物体相互吸引。在地球上，它将所有物体拉向地心。
An unbalanced force causes acceleration. Balanced forces keep an object at rest or moving at a constant speed.
非平衡力导致加速度。平衡力则使物体保持静止或匀速直线运动。
4. Energy Forms & Transfers | 能量形式与转移
Energy is the ability to do work. It can never be created or destroyed, only transferred or transformed.
能量是做功的能力。它不能被创造或消灭，只能被转移或转化。
Kinetic energy is the energy of movement. Potential energy is stored energy, such as gravitational potential or elastic potential.
动能是运动的能量。势能是储存的能量，例如重力势能或弹性势能。
Thermal energy is heat energy. Light energy travels in waves. Sound energy is produced by vibrations.
热能是热量。光能以波的形式传播。声能由振动产生。
Energy transfer by heating can occur through conduction (solids), convection (liquids and gases), and radiation (no medium needed).
热能传递可以通过传导（固体）、对流（液体和气体）和辐射（无需介质）进行。
In an energy diagram, Sankey diagrams show how much energy is useful and how much is wasted.
在能量图中，桑基图显示了有多少能量是有用的，有多少被浪费了。
5. States of Matter & Changes | 物质状态与变化
Everything is made of matter, which exists in three main states on Earth. Understanding their properties helps explain weather, cooking, and materials.
万物由物质构成，物质在地球上主要存在三种状态。理解它们的性质有助于解释天气、烹饪和材料。
Solid: particles are tightly packed in a fixed pattern, vibrate in place, and have a definite shape and volume.
固体：粒子紧密排列成固定模式，在原位振动，有确定的形状和体积。
Liquid: particles are close together but can slide past each other, so liquids have a definite volume but take the shape of their container.
液体：粒子相互靠近但能彼此滑动，因此液体有确定的体积，但形状随容器而变化。
Gas: particles are far apart and move quickly in all directions, so gases have no definite shape or volume.
气体：粒子相距很远，快速向各个方向运动，因此气体没有确定的形状或体积。
→ solid. Evaporation is liquid → gas at the surface, boiling occurs throughout the liquid.
熔化是固态→液态，凝固是液态→固态。蒸发是液体表面发生的液态→气态过程，沸腾则在整个液体中发生。
sation is gas → liquid, and sublimation is solid → gas directly, like dry ice (solid CO₂).
凝结是气态→液态，升华是固态直接变为气态，例如干冰（固态CO₂）。
6. Atoms, Elements & Compounds | 原子、元素和化合物
Chemistry starts with the idea that all substances are made of tiny particles. The vocabulary here builds a foundation for later topics.
化学始于所有物质均由微小粒子构成的理念。此处的词汇为后续主题奠定基础。
An atom is the smallest particle of an element that can take part in a chemical reaction.
原子是元素中能参与化学反应的最小粒子。
An element is a substance made of only one type of atom, such as oxygen (O) or iron (Fe).
元素是由一种原子组成的物质，例如氧(O)或铁(Fe)。
A compound is a substance made of two or more different types of atom chemically bonded together, like water (H₂O) or carbon dioxide (CO₂).
化合物是由两种或多种不同原子以化学键结合而成的物质，如水(H₂O)或二氧化碳(CO₂)。
A molecule is a group of two or more atoms held together by chemical bonds. Oxygen gas (O₂) is a molecule but not a compound.
分子是由化学键连接在一起的两个或多个原子的集团。氧气(O₂)是分子，但不是化合物。
The periodic table arranges elements in order of increasing atomic number. Groups are vertical columns; periods are horizontal rows.
元素周期表按原子序数递增排列元素。族是纵列；周期是横行。
7. Chemical Reactions | 化学反应
A chemical reaction makes new substances. Spotting the signs of a reaction and writing word equations are key skills.
化学反应生成新物质。识别反应迹象和书写文字方程式是关键技能。
In a reaction, reactants are substances you start with, and products are substances you end with.
在反应中，反应物是初始物质，生成物是最终物质。
hows the names of reactants and products, e.g., methane + oxygen → carbon dioxide + water.
文字方程式显示反应物和生成物的名称，例如：甲烷 + 氧气 → 二氧化碳 + 水。
Signs of a chemical change include colour change, temperature change, gas bubbles, precipitate formation, and light production.
化学变化的迹象包括颜色变化、温度变化、产生气泡、生成沉淀和发光。
An exothermic reaction releases heat to the surroundings; an endothermic reaction absorbs heat, making the surroundings cooler.
放热反应向周围环境释放热量；吸热反应吸收热量，使周围环境变冷。
A catalyst is a substance that speeds up a reaction without being used up itself.
催化剂是能加速反应而自身不被消耗的物质。
8. Cells & Organisms | 细胞与生物体
All living things are built from cells. Knowing the parts of a cell and their functions is fundamental to biology.
所有生物都由细胞构成。了解细胞的组成部分及其功能是生物学的基础。
A cell is the basic structural and functional unit of life. Organisms can be unicellular or multicellular.
细胞是生命的基本结构和功能单位。生物可以是单细胞或多细胞的。
An animal cell has a nucleus, cytoplasm, and cell membrane. A plant cell also has a cell wall, chloroplasts, and a permanent vacuole.
动物细胞有细胞核、细胞质和细胞膜。植物细胞还有细胞壁、叶绿体和永久液泡。
Diffusion is the movement of particles from an area of high concentration to an area of low concentration, with no energy needed.
扩散是粒子从高浓度区域向低浓度区域移动的过程，无需能量。
Osmosis is a special type of diffusion involving water molecules moving through a partially permeable membrane.
渗透是涉及水分子通过半透膜移动的一种特殊扩散形式。
Respiration is a chemical reaction in cells that releases energy from glucose, often using oxygen.
呼吸是细胞内从葡萄糖释放能量的化学反应，通常需要氧气。
9. Human Body Systems | 人体系统
Organs work together in systems to perform life processes. Memorising the names of organs and what they do helps you understand health and disease.
器官在系统中协同工作以完成生命活动。记住器官名称及其功能有助于理解健康和疾病。
The digestive system breaks down food into smaller, soluble molecules that can be absorbed into the blood. Key organs: stomach, small intestine, large intestine.
消化系统将食物分解成可溶的小分子，以便被吸收到血液中。关键器官：胃、小肠、大肠。
The circulatory system carries oxygen, nutrients, and waste products around the body. The heart pumps blood through arteries, veins, and capillaries.
循环系统在全身运输氧气、营养物质和废物。心脏将血液泵入动脉、静脉和毛细血管。
The respiratory system takes in oxygen and removes carbon dioxide. Gas exchange happens in the alveoli of the lungs.
呼吸系统吸入氧气并排出二氧化碳。气体交换在肺部的肺泡中进行。
The skeletal system provides support, protection, and movement. Muscles work in antagonistic pairs, like biceps and triceps.
骨骼系统提供支撑、保护和运动功能。肌肉以拮抗对的形式工作，例如肱二头肌和肱三头肌。
Homeostasis is the maintenance of a stable internal environment, such as keeping body temperature constant at about 37 °C.
稳态是维持稳定的内部环境，例如将体温保持在约37 °C恒定。
10. Ecosystems & Habitats | 生态系统与栖息地
Living organisms interact with each other and their environment. These terms describe the complex web of life.
生物体彼此之间以及与环境之间相互作用。这些术语描述了复杂的生命之网。
A habitat is the natural home of an organism. An ecosystem is a community of interacting organisms and their physical environment.
栖息地是生物的天然家园。生态系统是由相互作用的生物群落及其物理环境组成的整体。
A producer is an organism that makes its own food, usually by photosynthesis. A consumer eats other organisms.
生产者是自己制造食物的生物，通常通过光合作用。消费者是食用其他生物的有机体。
A food chain shows the flow of energy from one organism to another. A food web consists of many interconnected food chains.
食物链显示能量从一个生物到另一个生物的流动。食物网由许多相互连接的食物链组成。
A predator is an animal that hunts and eats other animals. Prey is the animal that is hunted.
捕食者是捕食其他动物的动物。猎物是被捕食的动物。
Decomposers, like bacteria and fungi, break down dead matter and return nutrients to the soil.
分解者，如细菌和真菌，分解死亡物质并将养分归还土壤。
11. Earth & Atmosphere | 地球与大气
Our planet is a dynamic system with a rocky surface, oceans, and an atmosphere of gases. Understanding its structure helps us address environmental challenges.
我们的星球是一个动态系统，有岩石表面、海洋和气体大气层。理解其结构有助于我们应对环境挑战。
The Earth's structure consists of the crust, mantle, outer core, and inner core. The crust is the thin, solid outermost layer.
地球的结构由地壳、地幔、外核和内核组成。地壳是薄而固体状的最外层。
Igneous rocks form from cooled magma or lava. Sedimentary rocks form from compressed layers of sediment. Metamorphic rocks form under heat and pressure.
火成岩由冷却的岩浆或熔岩形成。沉积岩由沉积物层压缩形成。变质岩在热和压力下形成。
The atmosphere is about 78% nitrogen, 21% oxygen, and small amounts of other gases, including carbon dioxide and water vapour.
大气中约有78%的氮气、21%的氧气和少量其他气体，包括二氧化碳和水蒸气。
The carbon cycle describes how carbon atoms move between living things, the atmosphere, oceans, and rocks.
碳循环描述了碳原子如何在生物体、大气、海洋和岩石之间移动。
Global warming is the increase in Earth's average surface temperature due to greenhouse gases, such as CO₂ and methane, trapping heat.
全球变暖是由于二氧化碳和甲烷等温室气体捕获热量，导致地球平均表面温度升高。
12. Tips for Memorising Vocabulary | 词汇记忆技巧
Learning hundreds of new terms can feel overwhelming, but with the right strategies you can make it stick.
学习数百个新术语可能会让人感到不知所措，但使用正确的策略可以使记忆变得牢固。
Use flashcards with the English term on one side and the Chinese definition on the other. Quiz yourself daily for short bursts.
使用抽认卡，一面写英文术语，另一面写中文定义。每天短时间自测。
Draw labelled diagrams or concept maps. For example, sketch a cell and label each part, then explain its function in both languages.
绘制带标签的图表或概念图。例如，画出细胞并标记各部分，然后用两种语言解释其功能。
Relate new terms to real life. When cooking, think about conduction, convection, and chemical changes. When breathing, recall the respiratory system.
将新术语与生活联系起来。烹饪时，思考传导、对流和化学变化。呼吸时，回忆呼吸系统。
Group related terms into clusters: all energy words together, all cell words together. This builds your mental 'filing system'.
将相关术语集中归类：所有能量词汇放在一起，所有细胞词汇放在一起。这能构建你的心智“归档系统”。
Practise writing sentences or short paragraphs that use the terms correctly in context. Bilingual writing is especially powerful for CCEA learners.
练习写出在上下文中正确使用术语的句子或简短段落。双语写作对于CCEA学习者尤为有效。
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