📚 Year 8 Cambridge Science: Vocabulary Terminology Quick Memorisation Guide | Year 8 剑桥科学：词汇术语速记指南
Mastering scientific terminology is the secret to understanding concepts and scoring high in your Year 8 Cambridge Science assessments. This guide breaks down essential terms from biology, chemistry and physics, pairing clear definitions with clever memory hooks. Read, repeat and recall – your internal glossary will grow fast.
掌握科学术语是理解概念并在Year 8剑桥科学测评中取得高分的秘诀。这份指南拆解了生物、化学和物理的核心词汇，将清晰的定义与巧妙的记忆挂钩配对。阅读、重复、回想——你的内部词汇库将迅速扩充。
1. Cells and Microscopy | 细胞与显微镜
Cell membrane – A selectively permeable barrier around every cell. It controls the movement of substances in and out, like a bouncer at a club. Memory trick: 'Membrane' sounds like 'member-only' – only some particles get membership.
细胞膜——每颗细胞周围的选择性透过屏障。它控制物质进出，就像俱乐部的门卫。记忆技巧：“膜”听起来像“模”，只允许部分粒子通过模型关卡。
Nucleus – The control centre of the cell, containing genetic material (DNA). Think of it as the cell's brain or head office. Trick: 'Nucleus' resembles 'nucleus of a team' – the leader.
细胞核——细胞的控制中心，含有遗传物质(DNA)。可以把它想象成细胞的大脑或总部。技巧：'Nucleus' 类似“核心”——团队的核心领导者。
Cytoplasm – A jelly-like substance where most chemical reactions occur. 'Cyto' means cell, 'plasm' means fluid. Picture a fruit jelly holding fruit bits – cytoplasm holds organelles.
细胞质——果冻状的胶状物质，大部分化学反应在此发生。'Cyto' 意为细胞，'plasm' 意为流体。想象果冻中藏有水果块——细胞质中悬浮着细胞器。
Mitochondria (singular: mitochondrion) – The powerhouse of the cell; they perform aerobic respiration to release energy. Memory: 'Mighty mitochondria' pump out power like mini engines.
线粒体（单数：线粒体）——细胞的动力工厂；它们进行有氧呼吸以释放能量。记忆：'Mighty mitochondria'（强大的线粒体）像小型引擎一样输出能量。
Chloroplast – Green discs in plant cells that absorb light for photosynthesis. They contain chlorophyll. 'Chloro-' means green, like chlorophyll in leaves. Recall: Chloroplasts = green solar panels.
叶绿体——植物细胞中的绿色圆盘，吸收光能进行光合作用。它们含有叶绿素。'Chloro-'意为绿色，就像树叶中的叶绿素。联想：叶绿体=绿色太阳能板。
Cell wall – A rigid outer layer of plant and fungal cells, made of cellulose. It provides structure and support. Think of a cardboard box protecting the cell's contents.
细胞壁——植物和真菌细胞外层的坚硬结构，由纤维素构成。它提供形状和支持。想象一个硬纸板盒子保护着细胞内容物。
2. States of Matter and Particle Theory | 物态与粒子理论
Solid – Particles are tightly packed in a regular pattern, vibrating in fixed positions. It has a definite shape and volume. Memory: 'Solid' soldiers standing rigidly in formation.
固体——粒子紧密排列成规则结构，在固定位置振动。它具有确定的形状和体积。记忆：“固体”像士兵笔直站立在队列中。
Liquid – Particles are close together but can slide past each other. It has a fixed volume but takes the shape of its container. Picture a crowd moving slowly through a corridor.
液体——粒子彼此靠近但能相互滑动。它有固定体积，但形状随着容器变化。想象一群缓慢穿过走廊的人流。
Gas – Particles are far apart and move randomly at high speed. It has no fixed shape or volume. Trick: 'Gas' is like a flock of flying birds, completely spread out.
气体——粒子间隔很远，快速随机运动。它没有固定的形状或体积。技巧：“气体”像一群飞散的鸟，完全散开。
Melting – Change from solid to liquid at the melting point. Particles gain energy and break free from fixed positions. Link: 'Melt' like ice cream melting under the sun.
熔化——在熔点时从固体变为液体。粒子获得能量，摆脱固定位置。联想：像冰淇淋在阳光下融化。
Freezing – Change from liquid to solid at the freezing point (same temperature as melting point). Particles lose energy and lock into place.
凝固——在凝固点（与熔点温度相同）从液体变为固体。粒子失去能量并被锁定到固定位置。
Diffusion – The net movement of particles from a region of higher concentration to a region of lower concentration. It happens in liquids and gases. The word sounds like 'diffuse' – spreading out. Remember: 'diff-use' – they flow to balance concentration.
扩散——粒子从高浓度区域向低浓度区域的净运动。发生在液体和气体中。这个词听起来像“散开”——扩散开来。记住：浓度差导致扩散流动。
3. Atoms, Elements and Compounds | 原子、元素与化合物
Atom – The smallest particle of an element that can exist. All substances are made of atoms. From Greek 'atomos' meaning indivisible. Visualise tiny building blocks.
原子——元素能够独立存在的最小粒子。所有物质都由原子构成。源自希腊语“atomos”，意为不可分割。想象极小的积木块。
Element – A substance made from only one type of atom. It cannot be broken down into simpler substances by chemical means. Examples: oxygen, iron, gold. The periodic table lists all elements.
元素——只由一种原子组成的物质。它不能通过化学方法分解成更简单的物质。例如：氧、铁、金。元素周期表列出了所有元素。
Compound – A substance made from two or more different elements chemically bonded together. It has a fixed ratio and unique properties. Example: water (H₂O) is a compound of hydrogen and oxygen. Trick: A compound is a 'composite' of elements.
化合物——由两种或多种不同元素通过化学键结合而成的物质。它有固定比例和独特的性质。例子：水(H₂O)是氢和氧的化合物。技巧：化合物就是元素的“复合”体。
Proton – A positively charged subatomic particle found in the nucleus. Think 'pro' = positive. Proton number determines the element.
质子——原子核中带正电荷的亚原子粒子。联想法：'pro' 像是“正”面的。质子数决定了元素种类。
Neutron – A neutral subatomic particle in the nucleus. Ne-utral, neut-ron. It adds mass but no charge.
中子——原子核中不带电荷的亚原子粒子。中性的“中”字与“中子”对应。增加质量但不带电荷。
Electron – A negatively charged particle that orbits the nucleus in shells. 'Electricity' starts with 'electr-' – electrons carry electric current. Electrons are tiny and light.
电子——原子核外分层排布的带负电荷粒子。'电子' 与电流有关——电子流动产生电流。电子非常微小且质量轻。
4. Forces and Motion | 力与运动
Force – A push or pull that can change an object's speed, direction or shape. Measured in newtons (N). Remember: Force makes things 'go', 'stop', or 'bend'.
力——能够改变物体速度、方向或形状的推或拉。单位是牛顿(N)。记住：力能使物体“走”、“停”或“弯”。
Friction – A force that opposes motion between two surfaces in contact. It can be useful (grip) or unwanted (wear). 'Friction' sounds like 'restriction' – restricting movement.
摩擦力——阻碍接触面间相对运动的力。它可能有益（抓地力），也可能有害（磨损）。听起来像“阻隔”——限制运动。
Gravity – A force of attraction between masses. On Earth it pulls objects towards the centre, giving weight. 'Grav-' means heavy, like 'gravity pulls you down'.
重力——质量之间的吸引力。在地球上它将物体拉向地心，赋予物体重量。'grav-' 意为沉重，就像重力把你往下拉。
Balanced forces – When forces on an object are equal in size but opposite in direction; the object stays at rest or moves at constant speed. Like a tug-of-war with no winner.
平衡力——作用在物体上的力大小相等、方向相反；物体保持静止或匀速直线运动。就像一场没有赢家的拔河。
Unbalanced forces – When forces are not equal, causing a change in speed or direction (acceleration). The resultant force is not zero. Imagine one team pulling harder in tug-of-war.
非平衡力——力不相等时，导致速度或方向改变（加速）。合力不为零。想象拔河中一队力量更大。
Speed – speed = distance / time. Scalar quantity (no direction). Think of a speedometer in a car.
速度——物体运动的快慢程度；单位时间通过的距离。公式：速度=距离/时间。标量（无方向）。联想汽车上的速度计。
5. Energy Transfers and Conservation | 能量转移与守恒
Kinetic energy – The energy an object has due to its motion. The faster it goes, the more kinetic energy. 'Kinetic' sounds like 'kinetic' = moving, like cinema (moving pictures).
动能——物体由于运动而具有的能量。速度越快，动能越大。“kinetic”与“运动”相关，像电影 cinema 是活动影像。
Gravitational potential energy (GPE) – Energy stored in an object because of its height above the ground. The higher up, the greater the GPE. Think: a ball on a shelf has 'potential' to fall.
重力势能 (GPE)——物体因位置较高而储存的能量。位置越高，重力势能越大。想象架子上的球具有下落的“潜力”。
Conduction – Transfer of thermal energy through a solid by particle vibrations. Metals are good conductors. Key idea: 'Conduct' like a baton conducting heat, particles pass the vibration.
传导——热量通过固体中粒子的振动传递。金属是良导体。关键：就像接力棒传递，粒子传递振动。
Convection – Transfer of heat in fluids (liquids and gases) by movement of the fluid itself. Hot fluid rises, cool fluid sinks. 'Convection current' – think of heating soup.
对流——流体（液体和气体）通过自身运动传递热量。热流体上升，冷流体下沉。“对流循环”——想象加热汤的过程。
Radiation – Transfer of energy by electromagnetic waves, mainly infrared. It can travel through a vacuum. Sunshine is radiation. No particles needed – 'Radiate' like rays spreading.
辐射——能量通过电磁波（主要是红外线）传递。它可以在真空中传播。阳光就是辐射。无需粒子——“辐射”如同光芒四射。
Energy conservation – Energy cannot be created or destroyed, only transferred or transformed. Total energy in a closed system remains constant. The universe's energy is recycled!
能量守恒——能量既不能被创造也不能被消灭，只能转移或转化。封闭系统的总能量保持不变。宇宙的能量被循环利用！
6. Respiration and Gas Exchange | 呼吸与气体交换
Aerobic respiration – curs in mitochondria. Word equation: glucose + oxygen → carbon dioxide + water (+ energy). 'Aero' means air (oxygen).
有氧呼吸——利用氧气分解葡萄糖以释放能量的过程。发生在线粒体中。文字方程式：葡萄糖 + 氧气 → 二氧化碳 + 水（+能量）。'Aero' 意为空气（氧气）。
Anaerobic respiration – Breaking down glucose without oxygen, producing less energy and lactic acid (in animals) or ethanol and carbon dioxide (in yeast). 'An-' means without. Important during hard exercise.
无氧呼吸——在无氧条件下分解葡萄糖，产生较少能量，并生成乳酸（动物）或乙醇和二氧化碳（酵母）。'An-' 意为无。在剧烈运动时很重要。
Alveoli (singular: alveolus) – Tiny air sacs in the lungs where gas exchange happens. They have thin walls and a large surface area. Picture clusters of microscopic grapes where oxygen diffuses in.
肺泡——肺部进行气体交换的微小气囊。壁薄且总表面积巨大。想象微小的葡萄串，氧气由此扩散进入血液。
Diaphragm – A dome-shaped muscle beneath the lungs that helps breathing. When it contracts and flattens, air is drawn in. 'Diaphragm' – think of a trampoline moving down to pull air in.
膈肌——肺下方圆顶状的肌肉，辅助呼吸。收缩变平时，将空气吸入肺部。联想蹦床下压让空气涌入。
7. Photosynthesis | 光合作用
Photosynthesis – green plants use light energy to convert carbon dioxide and water into glucose and oxygen. 'Photo-' means light, 'synthesis' ion: carbon dioxide + water → glucose + oxygen (in the presence of light and chlorophyll).
光合作用——绿色植物利用光能将二氧化碳和水转化为葡萄糖和氧气的过程。'Photo-' 意为光，'synthesis' 意为合成。文字式：二氧化碳 + 水 → 葡萄糖 + 氧气（需光和叶绿素）。
Chlorophyll – The green pigment inside chloroplasts that absorbs light energy for photosynthesis. 'Chloro-' green, 'phyll' leaf. It is why leaves are green.
叶绿素——叶绿体内部的绿色色素，吸收光能用于光合作用。'Chloro-' 绿，'phyll' 叶。这就是叶子是绿色的原因。
Limiting factors – Light intensity, carbon dioxide concentration and temperature can limit the rate of photosynthesis. Imagine a factory with three machines: the slowest one limits total output.
限制因素——光照强度、二氧化碳浓度和温度都可以限制光合作用速率。想象有三台机器的工厂：最慢的那台限制了总产量。
8. Types of Chemical Reactions | 化学反应类型
Combustion – A rapid reaction with oxygen that releases heat and light. Complete combustion of a hydrocarbon produces carbon dioxide and water. 'Combustion' is burning – 'com-bust' like a bus bursting into flames (but safely!).
燃烧——与氧气发生快速反应，释放热和光。碳氢化合物的完全燃烧生成二氧化碳和水。'Combustion' 就是烧——想象一辆巴士爆发火焰（安全的比喻！）。
Oxidation – A reaction where a substance gains oxygen or loses electrons. Rusting of iron is slow oxidation. 'Ox-' refers to oxygen. Oxidation adds oxygen.
氧化——物质获得氧或失去电子的反应。铁的生锈是缓慢氧化。'Ox-' 指氧。氧化就是加氧。
Thermal decomposition – into simpler ones using heat. Example: calcium carbonate → calcium oxide + carbon dioxide. 'Thermal' = heat, 'decomposition' = breaking apart.
热分解——利用热量将物质分解成更简单的物质。例如：碳酸钙 → 氧化钙 + 二氧化碳。'Thermal' 热，'decomposition' 分解。
Displacement – A more reactive element takes the place of a less reactive one in a compound. E.g., zinc displaces copper from copper sulfate. Memory: a bully pushes a weaker kid out of the seat.
置换反应——较活泼的元素将其较不活泼的元素从化合物中替换出来。例如锌从硫酸铜中置换出铜。记忆：一个“霸凌”把弱小朋友推出座位。
Neutralisation – Acid + base → salt + water. This reaction helps adjust pH. 'Neutral' means neither acidic nor basic. Think of a balanced scale.
中和反应——酸 + 碱 → 盐 + 水。这个反应调节pH值。“中性”表示既不酸也不碱。想象一个平衡的天平。
9. Acids and Alkalis | 酸与碱
Acid – A substance with pH less than 7 that releases hydrogen ions (H⁺) in water. Sour taste, corrosive. Lemon juice and vinegar are weak acids. 'Acid' sounds sharp, like citrus.
酸——pH值小于7、在水中释放氢离子(H⁺)的物质。有酸味，具腐蚀性。柠檬汁和醋是弱酸。“酸”听起来尖锐，像柑橘。
Alkali – A soluble base with pH greater than 7 that releases hydroxide ions (OH⁻) in water. Soap and baking soda are mild alkalis. 'Alkali' feels slippery.
碱——可溶性碱，pH大于7，在水中释放氢氧根离子(OH⁻)。肥皂和小苏打是温和碱。“碱”摸起来滑腻。
pH scale – A scale from 0 to 14 measuring how acidic or basic a solution is. 7 is neutral, below 7 acidic, above 7 alkaline. 'pH' can be remembered as 'power of Hydrogen'. Universal indicator shows a rainbow of colours.
pH 标度——从0到14的标尺，测量溶液的酸碱度。7为中性，<7酸性，>7碱性。'pH' 可记为“氢的强度”。通用指示剂显示彩虹色。
Indicator – A substance that changes colour in different pH conditions. Litmus turns red in acid, blue in alkali. Think of an indicator as a traffic light telling you acidity.
指示剂——在不同pH条件下变色的物质。石蕊在酸中变红，在碱中变蓝。把指示剂看作报告酸碱性的“交通指示灯”。
10. Electricity and Circuits | 电与电路
Current – The flow of electric charge, measured in amperes (A). In a circuit, current is the rate of flow of electrons. Water-flow analogy: current is like how much water flows per second.
电流——电荷的流动，单位安培(A)。在电路中，电流是电子流动的速率。水流类比：电流相当于每秒流过多少水量。
Voltage – The energy transferred per unit charge; the 'push' that drives current around a circuit. Measured in volts (V). Voltage is like the water pressure in pipes.
电压——每单位电荷传递的能量；推动电流在电路中流动的“推力”。单位伏特(V)。电压好比水管中的水压。
Resistance – Slows down the flow of current, measured in ohms (Ω). Conductors have low resistance, insulators high. 'Resist' means to oppose. A narrow pipe offers more resistance to water.
电阻——阻碍电流流动，单位欧姆(Ω)。导体电阻低，绝缘体电阻高。“抵抗”即阻碍。狭窄水管对水流阻力更大。
Series circuit – Components connected in a single loop; if one bulb breaks, all go out. Current is the same everywhere. 'Series' like a single chain.
串联电路——元件连成单一回路；一个灯泡坏了，所有灯都熄灭。电流处处相等。'Series' 就像一条单链。
Parallel circuit – Components are connected on separate branches; each gets full voltage. If one path breaks, others still work. Like multiple lanes on a motorway.
并联电路——元件连接在独立分支上；每条支路获得全部电压。一条支路断开，其他仍工作。就像高速公路上的多条车道。
11. Sound and Waves | 声与波
Wave – A disturbance that transfers energy from one place to another without transferring matter. Sound waves, water waves and light waves. The wave medium moves up and down, but energy travels forward.
波——将能量从一个地方传递到另一个地方而不传递物质的扰动。声波、水波和光波。波介质上下振动，而能量向前传递。
Amplitude – The maximum displacement from the rest position. In sound, larger amplitude means louder sound. Think of a guitar string plucked harder – bigger swing.
振幅——离开平衡位置的最大位移。在声音中，振幅越大，声音越响。想象更用力拨动吉他弦——摆动幅度更大。
Frequency – ete waves passing a point per second, measured in hertz (Hz). High frequency = high pitch. 'Frequent' means often. A squeaky voice has high frequency.
频率——每秒通过某点的完整波的数量，单位赫兹(Hz)。频率高=音调高。'Frequent' 意味着经常。尖细的嗓音频率高。
Wavelength – Distance between two consecutive crests or compressions. Shorter wavelength means higher frequency (for a constant speed). Visualise the distance between ocean wave peaks.
波长——两个连续波峰或压缩区之间的距离。波长短意味着频率高（速度恒定时）。想象海面上相邻波峰的距离。
Longitudinal wave – A wave where particles vibrate parallel to energy transfer. Sound waves are longitudinal comp
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