📚 KS3 OCR Science: Vocabulary & Terminology Memorisation Guide | KS3 OCR 科学：词汇术语速记指南
Science at KS3 is packed with new words that describe everything from tiny cells to huge forces. Mastering these terms early is the secret to feeling confident in lessons and smashing future GCSEs. This guide breaks down must-know OCR KS3 Science vocabulary and gives you clever memory tricks so you never mix up 'mitosis' and 'meiosis' again.
KS3 科学充满了描述从微小细胞到宏大作用力等一切的新词汇。早早掌握这些术语，是让你在课堂上充满信心并在未来 GCSE 中取得好成绩的秘诀。本指南拆解了 OCR KS3 科学必备词汇，并为你提供聪明的记忆技巧，让你再也不会混淆“有丝分裂”和“减数分裂”。
1. Cells and Microscopy | 细胞与显微观察
Cell membrane – the thin outer layer that controls what enters and leaves the cell. Think of it as a selective bouncer at a club: only certain substances get past. In plant cells, it lies just inside the cell wall.
细胞膜 – 控制物质进出细胞的薄外层。把它想象成俱乐部里挑剔的门卫：只有特定物质才能通过。在植物细胞中，它紧贴在细胞壁内侧。
Nucleus – the control centre containing DNA. The word sounds like 'nucleus of an atom', which is also a core. Picture the nucleus as the brain of the cell, issuing all the instructions.
细胞核 – 包含 DNA 的控制中心。这个词听起来像“原子核”，也是核心。把细胞核想象成细胞的大脑，发布所有指令。
Cytoplasm – a jelly-like substance where chemical reactions take place. The prefix 'cyto-' means cell, and 'plasm' sounds like 'plasma', a fluid. So cytoplasm is the cell's reaction fluid.
细胞质 – 发生化学反应的胶状物质。前缀 'cyto-' 表示细胞，'plasm' 听起来像 'plasma'（等离子体/浆液），因此细胞质就是细胞内的反应液体。
Mitochondria – organelles where respiration happens, releasing energy. Use the phrase 'mighty mitochondria' – they act as tiny power stations supplying energy for the cell.
线粒体 – 发生呼吸作用、释放能量的细胞器。用“强大的线粒体”来记忆——它们就像微型发电站，为细胞提供能量。
Chloroplast – found only in plant cells, this contains chlorophyll and absorbs light for photosynthesis. 'Chloro-' means green (think chlorophyll), so chloroplasts are green solar panels.
叶绿体 – 仅存在于植物细胞中，含有叶绿素，吸收光能进行光合作用。'Chloro-' 表示绿色（想想叶绿素），因此叶绿体就是绿色的太阳能板。
2. Specialised Cells and Tissues | 特化细胞与组织
Sperm cell – a male gamete with a tail for swimming and an acrosome containing enzymes to penetrate the egg. Imagine a tiny tadpole whose head is a drill and whose tail is an outboard motor.
精子细胞 – 带有用于游动的尾巴和含有酶以穿透卵子的顶体的雄性配子。想象一只小蝌蚪，头部是钻头，尾巴是舷外马达。
Nerve cell (neurone) – extremely long to carry electrical signals rapidly across the body. This cell looks like a wire with branched ends, transmitting messages like a telephone cable.
神经细胞（神经元） – 极长的细胞，用于在全身快速传递电信号。这种细胞看起来像末端分支的电线，像电话电缆一样传输信息。
Palisade cell – a leaf cell packed with chloroplasts near the upper surface to capture sunlight. Think of a neatly packed row of solar panels lining the top of a leaf.
栅栏细胞 – 靠近叶片上表面、充满叶绿体的细胞。想象一排整齐的太阳能电池板排列在叶片上表面。
Ciliated cell – found in the airways, covered in tiny hairs called cilia that beat and sweep mucus along. Picture thousands of tiny brooms brushing dust out of your lungs.
纤毛细胞 – 存在于气道中，覆盖着称为纤毛的微小毛发，能摆动并推动黏液。想象数千把微型扫帚把灰尘扫出肺部。
3. Organs and Digestive System | 器官与消化系统
Organ – a group of different tissues working together to perform a specific function. Use the phrase 'tissues teamwork to make an organ' – like stomach tissue teams up to digest food.
器官 – 一组不同的组织协同工作以执行特定功能。用“组织协力构成器官”来记忆——就像胃组织团队合作消化食物。
Enzyme – a biological catalyst that speeds up digestion without being used up. Its shape matches a substrate like a lock and key. Remember: 'enzyme' rhymes with 'time' – it saves time in reactions.
酶 – 一种生物催化剂，能加速消化而自身不被消耗。其形状与底物像锁和钥匙一样匹配。记住：'enzyme' 押韵 'time'（时间），它在反应中节省时间。
Peristalsis – waves of muscle contraction that push food along the digestive tract. Squeeze your hand along a tube of toothpaste – that is peristalsis in action.
蠕动 – 推动食物沿消化道前进的肌肉收缩波。用手沿牙膏管挤压——那就是蠕动在起作用。
Alveoli – tiny air sacs in the lungs where gas exchange occurs. Their name sounds like 'alveolar', which brings to mind a honeycomb – they provide an enormous surface area for oxygen to diffuse into the blood.
肺泡 – 肺部发生气体交换的微小气囊。名称听起来像“蜂窝状的”，让人联想到蜂巢——它们为氧气扩散到血液中提供了巨大的表面积。
4. Reproduction | 生殖
Gamete – a sex cell (sperm or egg) containing half the usual number of chromosomes. Think 'game of life' – gametes are the players that start the game of a new organism.
配子 – 含有通常数目一半染色体的性细胞（精子或卵子）。联想“生命游戏”——配子就是开启新生命游戏的玩家。
Fertilisation – fusion of a sperm nucleus with an egg nucleus to form a zygote. Just as fertiliser spreads on fields to help growth, fertilisation joins two halves of the genetic blueprint.
受精 – 精子细胞核与卵细胞核融合形成受精卵的过程。就像在田野上撒肥料帮助生长一样，受精将遗传蓝图的两半结合在一起。
Placenta – an organ that develops during pregnancy to exchange nutrients, gases and waste between mother and foetus. Picture it as a supermarket and waste-disposal unit rolled into one.
胎盘 – 在怀孕期间发育的器官，在母体和胎儿之间交换营养物质、气体和废物。把它想象成一个集超市和废物处理单元于一体的器官。
Menstruation – the monthly shedding of the uterus lining when fertilisation does not occur. Remember 'menstrual' and 'month' both start with 'm': it happens roughly every month.
月经 – 当没有发生受精时，每月子宫内膜的脱落。记住“月经（menstrual）”和“月（month）”都以'm'开头：大约每月发生一次。
5. Particles and States of Matter | 粒子与物质状态
Diffusion – the net movement of particles from a region of high concentration to low concentration. Imagine opening a perfume bottle: the smell diffuses into the room without any help.
扩散 – 粒子从高浓度区域向低浓度区域的净移动。想象打开一瓶香水：气味无需任何帮助就扩散到整个房间。
Melting point – hich a solid becomes a liquid. Pure substances melt sharply, like ice in a drink; think of 'melting point = turning point' for the solid.
熔点 – 固体变成液体的温度。纯物质熔化得很干脆，就像饮料中的冰；可以把“熔点”想象成固体的“转折点”。
Sublimation – when a solid turns directly into a gas, skipping the liquid stage. Visualise a 'submarine' shooting from the ocean floor straight into the 'sky' – solid to gas.
升华 – 固体不经过液态直接变成气体的过程。联想“潜水艇”（submarine）从海底直接射向“天空”（sky）——固变气。
Pressure in gases – caused by particles colliding with the walls of their container. More collisions mean higher pressure. Picture a swarm of tiny bouncing balls continually hammering the inside of a balloon.
气体压强 – 由粒子与容器壁碰撞引起。碰撞越多，压强越大。想象一群微小的弹跳球不停地撞击气球的内壁。
6. Atoms, Elements and Compounds | 原子、元素和化合物
Atom – the smallest part of an element that can exist. The word comes from Greek 'atomos', meaning uncuttable. Every substance is built from these tiny building blocks.
原子 – 能够存在的元素的最小部分。这个词来自希腊语“atomos”，意为不可分割。每种物质都是由这些微小的构建块构成的。
Element – a substance made of only one type of atom, listed on the periodic table. Think of an element as an 'elementary' substance that cannot be broken down into simpler chemicals.
元素 – 仅由一种原子组成的物质，列于元素周期表中。把元素想象成一种“基本的”物质，无法分解成更简单的化学物质。
Compound – two or more different elements chemically bonded, like H₂O or CO₂. Remember 'compound' as a composite: several parts joined together, just like a compound word.
化合物 – 两种或多种不同元素通过化学键结合的物质，如 H₂O 或 CO₂。记住“compound”表示复合：几个部分结合在一起，就像复合词一样。
Chemical formula – mbols and numbers. E.g. NaCl represents one sodium and one chlorine atom. Use the mnemonic 'formula = formal list' of atoms.
化学式 – 用符号和数字表示化合物中原子的简写方式。如 NaCl 代表一个钠原子和一个氯原子。用“公式=正式清单”来记忆原子的正式列表。
7. Chemical Reactions and Equations | 化学反应与方程式
Reactant – a starting substance in a chemical reaction. Think 'reactants react' – they are the ingredients you put in before the change happens.
反应物 – 化学反应中的起始物质。记住“反应物参与反应”——它们是你放入的、在变化发生之前的成分。
Product – , like the cake from a mix. Arrow points from reactants to products: reactants → products.
生成物 – 化学反应产生的物质。生成物就是你得到的东西，就像从混合料中烘出的蛋糕。箭头从反应物指向生成物：反应物 → 生成物。
Exothermic – a reaction that transfers energy to the surroundings, often as heat. 'Exo' means exit; heat exits the system. Hand warmers are a great example.
放热反应 – 向周围环境传递能量（通常是热量）的反应。“Exo”表示向外；热量离开系统。暖手宝就是一个很好的例子。
Catalyst – a substance that speeds up a reaction without being used up. Imagine a catalyst as a cheerful cat that hurries the reaction along but remains unchanged.
催化剂 – 一种加快反应速度而自身不被消耗的物质。把催化剂想象成一只快乐的猫，它催促着反应进行，但自己不变。
8. Acids and Alkalis | 酸和碱
Acid – a substance with a pH less than 7 that releases H⁺ ions in water. Citrus fruits contain citric acid. Recall 'acid' starts with the same 'a' as 'sour' in many languages (acido).
酸 – pH 值小于 7、在水中释放 H⁺ 离子的物质。柑橘类水果含有柠檬酸。回想“acid”和许多语言中“酸”的开头字母一样。
Alkali – a soluble base with a pH greater than 7, producing OH⁻ ions. Soap feels slippery because it is alkaline. Link 'alkali' to 'alkaline' – the opposite of acid.
碱 – pH 值大于 7 的可溶性碱，产生 OH⁻ 离子。肥皂摸起来滑滑的，因为它是碱性的。把“alkali”联系到“alkaline”（碱性的）——酸的反面。
Neutralisation – c word equation: acid + alkali → salt + water. Think of neutralising a bully with kindness – both extremes cancel out.
中和反应 – 酸和碱反应生成盐加水的过程。经典的文字方程式：酸 + 碱 → 盐 + 水。想象用善意中和欺凌——两个极端相互抵消。
pH scale – a measure of acidity from 0 (very acidic) to 14 (very alkaline), with 7 being neutral. Use the phrase 'potential of Hydrogen' to remember pH; 7 is middle, like the centre of a rugby pitch.
pH 标度 – 测量酸碱度的标度，从 0（强酸）到 14（强碱），7 为中性。用“氢离子的潜能（potential of Hydrogen）”来记忆 pH；7 在中间，就像橄榄球场中心。
9. Forces and Motion | 力与运动
Force – a push or pull measured in newtons (N). Forces can change an object's speed, direction or shape. Visualise a football being kicked – the foot applies a force.
力 – 一种推或拉，以牛顿 (N) 为单位测量。力可以改变物体的速度、方向或形状。想象一只足球被踢——脚施加了力。
Friction – a force that opposes motion between two surfaces. It can be useful (like grip on shoes) or unwanted. Think of rubbing your hands together – the warmth you feel is friction in action.
摩擦力 – 阻碍两个表面之间运动的力。它可能有用（如鞋子的抓地力），也可能有害。想想双手摩擦——感受到的温暖就是摩擦力在起作用。
Weight – tational field strength (W = m × g). On Earth, g ≈ 10 N/kg. Weight is not the same as mass!
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