📚 Year 9 CCEA Science: Vocabulary & Terminology Memory Guide | Year 9 CCEA 科学：词汇术语速记指南
Mastering scientific vocabulary is the foundation of understanding every topic in Year 9 CCEA Science. This guide compiles high-frequency terms from biology, chemistry and physics, explaining each one in clear English and providing Chinese memory tips. Read it as a quick revision tool to sharpen your recall and build confidence for assessments.
掌握科学词汇是在 Year 9 CCEA 科学中理解每个主题的基础。本指南汇集了生物、化学和物理中的高频术语，用清晰的英文解释每一个，并配以中文记忆技巧。把它当作快速复习工具，可以加强记忆、建立考试信心。
1. Scientific Enquiry Terms | 科学探究术语
Hypothesis: A testable idea or prediction based on scientific knowledge.
假设：基于科学知识提出的可检验的预测。联想“hypo-”(下面)+“thesis”(命题)，想象它是一座等待检验的桥墩。
Independent variable: The factor you change deliberately in an experiment.
自变量：实验中你主动改变的那个因素。“独立”意味着只有你才可以操控它。
Dependent variable: The factor you measure or observe; it changes in response to the independent variable.
因变量：你测量或观察的因素，它随着自变量的改变而改变——“取决于”自变量的变化。
Control variable: Any factor kept constant to ensure a fair test.
控制变量：为了让实验公平而保持不变的任何因素。记住：控制变量就是你必须“控制住”不让它捣乱的量。
Fair test: An investigation where only the independent variable affects the dependent variable, with all other conditions controlled.
公平测试：只有自变量影响因变量、其他条件全部受控的探究。把你的实验想象成一场规则严格的比赛。
Reliability: The consistency of results when measurements are repeated.
可靠性：重复测量时结果的一致程度。多次测量取平均值可以提高可靠性。
2. Cells and Organisation | 细胞与组织
Cell membrane: A thin, flexible barrier around the cell that controls what enters and leaves.
细胞膜：包裹细胞的一层薄而柔软的屏障，控制物质进出。像细胞的“边界安检”，选择性放行。
Nucleus: The organelle containing genetic material (DNA) that controls cellular activities.
细胞核：含有 DNA 并控制细胞活动的结构。可以看作细胞的“总指挥部”。
Cytoplasm: The jelly-like substance where chemical reactions take place inside the cell.
细胞质：细胞内发生化学反应的胶状物质。像工厂的“生产车间”，许多反应在此进行。
Tissue: A group of similar cells working together to perform a specific function.
组织：一组形态相似的细胞共同完成特定功能。多个“同类细胞”协作形成组织。
Organ: A structure made of different tissues that carries out a vital function, e.g. the heart.
器官：由不同组织构成、执行重要功能的结构，如心脏。器官是比组织更高一级的“功能单位”。
Organ system: A group of organs working together to perform complex tasks, e.g. the digestive system.
器官系统：一组协调工作的器官，如消化系统。多个器官联手组成一个“系统工程”。
Specialised cell: A cell adapted to perform a specific job, such as a nerve cell or red blood cell.
特化细胞：为特定功能而发生形态适应的细胞，如神经细胞、红细胞。它们“专精一门手艺”。
Diffusion: The net movement of particles from a region of higher concentration to a region of lower concentration.
扩散：粒子从高浓度区域向低浓度区域的净移动。不需要额外能量，顺其自然地“散开”。
3. Reproduction and Inheritance | 生殖与遗传
Gamete: A sex cell (sperm in males, egg in females) containing half the normal number of chromosomes.
配子：性细胞（雄性为精子，雌性为卵细胞），含有正常染色体数的一半。“传下去的半份蓝图”。
Fertilisation: The fusion of a male and a female gamete to form a zygote.
受精：精子和卵子融合形成受精卵的过程。两个半份蓝图合成完整的遗传方案。
Zygote: The single cell formed after fertilisation that will develop into an embryo.
受精卵：受精后形成的单个细胞，将发育成胚胎。它是新生命的第一个细胞。
DNA: Deoxyribonucleic acid, the molecule that carries genetic information in all living organisms.
脱氧核糖核酸：携带生物遗传信息的分子。可以想象成一份巨长的带有全部指令的螺旋拉链。
Gene: A section of DNA that codes for a particular characteristic.
基因：DNA 上编码特定性状的一段。基因好比 DNA 字符串中的一段“功能词语”。
Chromosome: A thread-like structure in the nucleus made of tightly coiled DNA; humans have 46.
染色体：细胞核内由 DNA 紧密缠绕而成的线状结构，人类有 46 条。它们是包装好的“遗传说明书卷轴”。
Dominant allele: A version of a gene that is always expressed if present, even with one copy.
显性等位基因：只要存在一个拷贝就会表现出来的基因版本。它就像具有强势话语权的声音。
Recessive allele: A version of a gene that is expressed only when two copies are present.
隐性等位基因：只有当两个拷贝同时存在时才会表现的基因版本。仿佛需要双独奏才能被听见的音符。
4. Ecosystems and Interdependence | 生态系统与相互依存
Habitat: The natural home or environment of an organism.
栖息地：生物的自然居住环境。联想“habit”居住的地方，生物的习惯居所。
Population: All the organisms of the same species living in the same area at the same time.
种群：同一时间同一区域内同一物种的所有个体。好比城市中所有同一类型的小区居民。
Community: All the populations of different species that live together in a habitat.
群落：栖息地中所有不同物种的种群总和。它是由不同“邻舍”组成的生命集合。
Ecosystem: The interaction of a community of living organisms with the non-living parts of their environment.
生态系统：生物群落与其周围非生物环境相互作用的整体。记住“生态+系统”，一个动态的相互依赖网络。
Producer: An organism that makes its own food using energy from the Sun, e.g. a green plant.
生产者：利用太阳光能制造自身食物的生物，如绿色植物。它们是食物链的“能量起点”。
Consumer: An organism that obtains energy by eating other organisms.
消费者：通过摄食其他生物获取能量的生物。它不能自产，只能“消费”现成的有机物。
Decomposer: An organism, such as a bacterium or fungus, that breaks down dead material and recycles nutrients.
分解者：细菌或真菌等分解死物质、循环养分的生物。它们是生态系统的回收站。
Food web: A network of interconnected food chains showing feeding relationships in an ecosystem.
食物网：相互联系的食物链网络。比起单线食物链，更像一张复杂的捕食关系网。
5. Atoms, Elements and Compounds | 原子、元素与化合物
Atom: The smallest particle of an element that can take part in a chemical reaction.
原子：能参加化学反应的元素最小粒子。想成一个不能轻易分割的球体积木。
Element: A pure substance made of only one type of atom, listed on the Periodic Table.
元素：仅由一种原子组成的纯净物，列在元素周期表中。每种元素都像一种独一无二的乐高色块。
Compound: A substance formed when two or more different elements chemically combine in fixed proportions.
化合物：由两种或多种不同元素按固定比例化学结合而成的物质。化合物是不同原子“牵手”后的新物质。
Molecule: Two or more atoms chemically bonded together; can be same or different elements.
分子：两个或以上原子通过化学键结合的整体。分子可以是相同元素的组合，如 O₂。
Periodic Table: A chart organising all known elements in order of increasing atomic number, grouped by similar properties.
元素周期表：按原子序数递增排列、将性质相似的元素放入同一族的图表。“周期”暗示性质周期性重现。
Group: A vertical column in the Periodic Table; elements in the same group have similar chemical properties.
族：周期表中的竖列，同族元素化学性质相似。像是共享家族特征的化学“宗族”。
Atomic number: The number of protons in the nucleus of an atom, which defines the element.
原子序数：原子核中的质子数，决定元素身份。它就是元素在周期表上的“身份证号码”。
6. Chemical Reactions | 化学反应
Reactant: A substance that takes part in and undergoes change during a reaction.
反应物：参与化学反应并发生变化的物质。站在“起跑线”上的化学选手。
Product: A substance formed as a result of a chemical reaction.
生成物：化学反应中产生的新物质。它们是反应结束后冲过终点线的结果。
Exothermic reaction: A reaction that releases energy to the surroundings, usually as heat.
放热反应：向周围释放能量的反应，常常表现为升温。“exo-”向外，热量“出门”了。
Endothermic reaction: A reaction that absorbs energy from the surroundings, causing a temperature drop.
吸热反应：从周围吸收能量的反应，温度下降。“endo-”向内，热量被“吸进”系统。
Catalyst: A substance that speeds up a chemical reaction without being used up itself.
催化剂：能加快反应速率而自身不被消耗的物质。它好比反应中的“加速助手”，事成后全身而退。
Word equation: A way of summarising a reaction using the names of reactants and products, e.g.
magnesium + oxygen → magnesium oxide
文字方程式：用反应物与生成物名称概括反应的方法，例如 镁 + 氧气 → 氧化镁。箭头前是起点，后是终点。
Conservation of mass: In a chemical reaction, the total mass of reactants equals the total mass of products.
质量守恒：化学反应中反应物总质量等于生成物总质量。原子只是重新组合，质量永不消失。
7. Acids and Alkalis | 酸与碱
Acid: A substance with a pH less than 7 that releases hydrogen ions (H⁺) in solution.
酸：pH 小于 7 的物质，在水溶液中释放氢离子 (H⁺)。味道酸、有腐蚀性，常见的如盐酸。
Alkali: A soluble base with a pH greater than 7 that releases hydroxide ions (OH⁻) in water.
碱：一种可溶性碱，pH 大于 7，在水溶液中释放氢氧根离子 (OH⁻)。触感滑腻，可以中和酸。
pH scale: A numerical scale from 0 to 14 measuring how acidic or alkaline a solution is; 7 is neutral.
pH 标度：从 0 到 14 衡量溶液酸碱性的数值标度，7 为中性。数字越小酸性越强，越大碱性越强。
Indicator: A dye that changes colour depending on the pH of the solution, e.g. litmus or universal indicator.
指示剂：依 pH 变化而变色的染料，如石蕊或通用指示剂。它像 pH 的“颜色翻译官”。
Neutralisation: The reaction between an acid and an alkali that produces salt and water:
acid + alkali → salt + water
中和反应：酸与碱反应生成盐和水的过程。记住“酸碱相遇，化敌为盐和水”。
Salt: An ionic compound formed when the hydrogen of an acid is replaced by a metal or ammonium ion.
盐：酸中的氢被金属或铵根离子替代后形成的离子化合物。日常食盐只是盐的一种。
8. Forces and Motion | 力与运动
Force: A push or pull acting on an object, measured in newtons (N).
力：作用在物体上的推或拉，单位是牛顿。它是一种能让物体运动状态改变的相互作用。
Newton: The SI unit of force; 1 N is the force needed to accelerate 1 kg by 1 m/s².
牛顿：力的国际单位，1 牛顿是使 1 千克物体获得 1 米每秒平方加速度的力。
Gravity: A non-contact force of attraction between masses; on Earth it gives objects weight.
重力：质量之间相互吸引的非接触力；在地球上它赋予物体重量。它是让我们双脚着地的力量。
Friction: A contact force that opposes motion between two surfaces in contact.
摩擦力：两个接触表面相对运动时产生的阻碍力。它使滑动的物体减速或防止滑动。
Balanced forces: When forces acting on an object are equal in size and opposite in direction, resulting in no change in motion.
平衡力：作用在物体上的力大小相等、方向相反，物体的运动状态保持不变。静者恒静，动着匀速。
Unbalanced forces: When the resultant force is not zero, causing the object to accelerate or decelerate.
非平衡力：合力不为零，导致物体加速或减速。力度不均，运动改变。
Speed: The rate at which an object covers distance; calculated by
speed = distance ÷ time
速率：物体移动距离的快慢程度，公式：速率 = 距离 ÷ 时间。单位可以是 m/s 或 km/h。
9. Energy and Electricity | 能量与电学
Energy: The capacity to do work; measured in joules (J). It can be stored or transferred but never created or destroyed.
能量：做功的本领，单位是焦耳。它可储存和转移，但不会凭空创生或消灭。
Kinetic energy: The energy an object possesses due to its motion.
动能：物体因运动而具有的能量。速度越快、质量越大，动能越大。
Gravitational potential energy: Energy stored in an object because of its position in a gravitational field, e.g. a raised weight.
重力势能：物体因在重力场中的高度而储存的能量。举得越高，拥有的势能越多。
Current (I): The flow of electric charge around a circuit, measured in amperes (A).
电流：电荷在电路中的流动，单位是安培。想象成管道中水的流量。
Voltage (V): The 'push' that drives current around a circuit
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