📚 Pre-U CCEA Engineering: Vocabulary Quick-Memorization Guide | Pre-U CCEA 工程：词汇术语速记指南
Mastering the technical vocabulary of CCEA Pre-U Engineering is not about rote memorisation—it is about building mental associations that anchor each term in real-world applications. This guide organises key terminology by topic, pairing clear explanations with memory hooks such as root meanings, acronyms, and conceptual diagrams. Each entry is presented in an English-Chinese pair so that bilingual learners can reinforce understanding through dual-language recall.
掌握 CCEA Pre-U 工程的术语词汇并非死记硬背，而是要建立心理关联，让每个术语都能扎根于实际应用。本指南按主题将关键术语分类，将清晰的解释与词根意义、首字母缩略词和概念图示等记忆钩子相结合。每个词条均采用英中对照的形式，帮助双语学习者通过双重语言回忆来巩固理解。
1. Materials Science and Properties | 材料科学与性能
The term ‘ductile’ comes from the Latin ductilis, meaning ‘that may be drawn out’. Think of copper being pulled into a thin wire—this image locks the definition into memory.
‘Ductile’（延展性）一词源自拉丁语 ductilis，意为“可被拉长的”。想象铜被拉成细丝的情景——这个画面能把定义牢牢记在脑中。
‘Brittle’ materials fracture with little plastic deformation; the word snaps like the material itself. Visualise a ceramic mug shattering when dropped, and you will never confuse brittle with ductile.
‘Brittle’（脆性）材料在几乎没有塑性变形的情况下就会断裂；这个词本身就像材料一样干脆。想象陶瓷杯掉落时碎裂的场景，你就永远不会把脆性与延展性混淆。
The Young modulus is a measure of stiffness. Its equation
E = σ / ε
reminds you that it is the slope of the stress-strain graph in the elastic region. Memorise it as ‘stress over strain—stiffness remains’.
杨氏模量是刚度的量度。其公式
E = σ / ε
提醒你，它是应力-应变图弹性区内的斜率。用谐音记：“硬性模量——应力除以应变”。
‘Elastic limit’ is the maximum stress a material can withstand and still return to its original shape. The word ‘limit’ signals a boundary: beyond this point, permanent deformation begins.
‘弹性极限’是材料能承受并仍能恢复原状的最大应力。“极限”一词标志着一个边界：一旦超过，永久变形就开始了。
‘Hardness’ resists indentation or scratching. Associate it with the Mohs scale—diamond scratches all, talc scratches none. For metals, think of a ball bearing pressing into the surface in a Brinell test.
‘硬度’抵抗压痕或划痕。将其与莫氏硬度关联起来——金刚石可刻划一切，滑石则不行。对于金属，想象布氏硬度测试中一个钢球压入表面的情景。
2. Mechanical Properties and Testing | 力学性能与测试
‘Tensile strength’ is the maximum stress while being pulled before necking. The word ‘tensile’ shares its root with ‘tension’ and ‘tent’—all about stretching. In a tensile test, the specimen stretches until it breaks.
‘抗拉强度’是材料在被拉伸至颈缩前所能承受的最大应力。’tensile’（拉伸）与“tension”（张力）和“tent”（帐篷）同根，均与拉伸有关。在拉伸试验中，试样一直拉伸直至断裂。
‘Toughness’ is the energy absorbed before fracture—the area under the whole stress-strain curve. Think of a tough person absorbing life’s blows; a tough material absorbs impact energy without shattering.
‘韧性’是断裂前吸收的能量，即整个应力-应变曲线下的面积。想象一个坚韧的人承受生活的打击；韧性材料吸收冲击能量而不会碎裂。
‘Fatigue’ failure occurs under cyclic loading, even at stresses below yield. The name hints that the material ‘gets tired’ after repeated stress. Remember the S-N curve (stress vs. number of cycles).
‘疲劳’失效发生在循环载荷下，即使应力低于屈服强度。这个名称暗示材料在反复受力后“感到疲倦”。记住 S-N 曲线（应力与循环次数的关系）。
‘Creep’ is slow, permanent deformation under constant stress at high temperature. Creep sounds like ‘creep’ing slowly; a turbine blade under centrifugal force at high temperature gradually lengthens.
‘蠕变’是在高温和恒定应力下发生的缓慢永久变形。Creep 像“creeping”（爬行）一样缓慢；高温下承受离心力的涡轮叶片会逐渐伸长。
The Charpy impact test measures toughness by striking a notched specimen. Notch + hammer = energy absorbed. Visualise the pendulum swinging and snapping the sample—the energy loss is the toughness.
夏比冲击试验通过撞击缺口试样来测量韧性。缺口 + 锤子 = 吸收的能量。想象摆锤摆动并击断试样的情景——能量损失即为韧性。
3. Forces, Stress and Strain | 力、应力与应变
‘Stress’ is internal resistance force per unit area:
σ = F / A
Think of stress as the ‘intensity of internal push-pull’. The unit is Pa (N/m²), which is pressure-like.
‘应力’是单位面积上的内部抵抗力：
σ = F / A
将应力视为“内部推拉力的强度”。单位是 Pa（N/m²），类似于压强。
‘Strain’ is the ratio of extension to original length:
ε = ΔL / L
It is dimensionless. Remember ‘strain stretches’; it measures how much the material stretches relative to its original length.
‘应变’是伸长量与原长之比：
ε = ΔL / L
它是一个无量纲数。用“strain stretches”来记，它度量材料相对于原长伸长了多少。
‘Shear stress’ acts parallel to the cross-section, like scissors.
τ = F / A
The symbol τ (tau) looks like a sheared T—a visual memory aid.
‘剪应力’平行于截面作用，如同剪刀。
τ = F / A
符号 τ（tau）像一个被剪切的 T 字母，是视觉记忆辅助。
‘Poisson’s ratio’ relates lateral strain to axial strain. When you stretch a rubber band, it gets thinner—that negative ratio links width shrinkage to length extension. Symbol ν (nu) is like a skinny ‘v’.
‘泊松比’是横向应变与轴向应变的比值。当你拉伸橡皮筋时，它会变细——这个负比率将宽度收缩与长度伸长联系起来。符号 ν（nu）就像一个瘦长的“v”。
‘Factor of safety’ is the ratio of ultimate stress to allowable stress. A bridge designed with a factor of 4 means it can hold four times the maximum expected load before failure—a safety cushion.
‘安全系数’是极限应力与许用应力的比值。一座桥若设计安全系数为 4，意味着它能承受最大预期负荷的 4 倍才失效——一个安全缓冲。
4. Electronics and Circuit Theory | 电子学与电路理论
‘Ohm’s law’ states
V = I × R
Voltage drives current through resistance. Picture a water pipe: voltage is pressure, current is flow, resistance is pipe narrowness.
‘欧姆定律’指出
V = I × R
电压驱动电流通过电阻。设想一根水管：电压是水压，电流是水流，电阻是管子的狭窄程度。
‘Kirchhoff’s current law’ (KCL): the sum of currents entering a node equals the sum leaving. Think of a junction of roads—cars entering must equal cars exiting, or there would be a pile-up.
‘基尔霍夫电流定律'(KCL)：流入节点的电流之和等于流出电流之和。想想道路交叉口——进入的车辆必须等于离开的车辆，否则就会堵塞。
‘Kirchhoff’s voltage law’ (KVL): around any closed loop, the sum of emf equals the sum of the p.d. drops. Imagine a roller coaster looping back to start—all the ups and downs must sum to zero height change.
‘基尔霍夫电压定律'(KVL)：在任何一个闭合回路中，电动势之和等于电压降之和。想象过山车回到起点——所有上升下降的高度变化总和必须为零。
‘Capacitance’ measures a component’s ability to store charge:
C = Q / V
The unit is the farad (F). A capacitor is like an elastic tank for charge—bigger capacitance, more charge stored per volt.
‘电容’衡量元件储存电荷的能力：
C = Q / V
单位是法拉 (F)。电容器就像一个储存电荷的弹性容器——电容越大，每伏特储存的电荷越多。
‘Inductance’ is the property that opposes changes in current. An inductor is a coil; think of a spinning flywheel that resists changes in rotational speed—inductance resists changes in current flow.
‘电感’是阻碍电流变化的特性。电感器是一个线圈；想象一个旋转的飞轮阻碍转速变化——电感阻碍电流流动的变化。
5. Digital Logic and Microcontrollers | 数字逻辑与微控制器
A logic gate is a building block of digital circuits. The AND gate outputs 1 only if all inputs are 1—like having both switches closed for a light to turn on.
逻辑门是数字电路的基本构件。AND 门只有在所有输入均为 1 时才输出 1，就像两个开关都闭合时灯才亮。
The truth table lists all input combinations and corresponding outputs. Draw a table with all possible 1/0 patterns—systematic, complete, and clear for debugging.
真值表列出所有输入组合及其对应输出。画一个包含所有 1/0 可能模式的表格——系统、完整且便于调试。
A flip-flop is a bistable memory element. It ‘flips’ to one state and ‘flops’ to the other—like a light switch that stays in its last position until toggled again.
触发器是一种双稳态记忆元件。它“翻转”到一种状态，再“翻回”到另一种状态，就像一个保持最后位置的灯开关，直到再次拨动。
In a microcontroller (MCU), the CPU, RAM, ROM, and I/O are integrated on one chip. Think of an Arduino: it reads sensors, processes, and controls actuators. The term ’embedded system’ implies it is part of a larger product.
在微控制器 (MCU) 中，CPU、RAM、ROM 和 I/O 集成在一个芯片上。想想 Arduino：它读取传感器信号，进行处理并控制执行器。“嵌入式系统”一词表示它是更大产品的一部分。
PWM (Pulse Width Modulation) varies the duty cycle to control power output. A rectangular wave switches between on and off; the fraction of on-time determines the effective voltage. Used for motor speed and LED dimming.
PWM（脉宽调制）通过改变占空比来控制输出功率。一个矩形波在开和关之间切换；导通时间的比例决定了有效电压。用于电机调速和 LED 调光。
6. Engineering Design Process | 工程设计流程
The design process often uses the acronym APIE: Analyse, Plan, Implement, Evaluate. Think of a chef: analyse the recipe, plan ingredients, implement cooking, evaluate taste.
设计流程常用首字母缩写 APIE：分析 (Analyse)、计划 (Plan)、实施 (Implement)、评价 (Evaluate)。想象一位大厨：分析食谱、计划食材、实施烹饪、评价口味。
A design brief is a concise statement of the problem and constraints. It defines the ‘what’ without prescribing the ‘how’. A good brief steers creativity without narrowing it too early.
设计任务书是对问题与约束条件的简洁陈述。它定义了“做什么”，而不预先规定“怎么做”。一份好的任务书引导创意，但又不过早限制方向。
The design specification quantifies requirements: dimensions, performance, materials, cost. It turns the brief into measurable targets. Think of it as a score sheet the final solution must meet.
设计规范将需求量化：尺寸、性能、材料、成本。它把任务书转化为可度量的目标。可将其视为最终方案必须达到的计分表。
Iterative design uses repeated cycles of prototyping, testing, and refinement. Each cycle improves the product. The spiral model visually captures this idea—never a straight line to perfection.
迭代设计通过原型制作、测试和改进的多次循环进行。每个循环都让产品变得更好。螺旋模型形象地捕捉了这一理念——通向完善从不是一条直线。
Concurrent engineering involves cross-functional teams working in parallel, not sequentially. Marketing, design, manufacturing, and servicing cooperate from the start. Imagine an orchestra playing together rather than one instrument finishing before the next begins.
并行工程让跨职能团队并行工作，而非串行。营销、设计、制造和服务从一开始就协同合作。想象一支管弦乐队齐奏，而不是一件乐器奏完才轮到下一件。
7. Manufacturing Processes | 制造工艺
Casting pours molten metal into a mould. Think of wax candles or bronze statues. Sand casting, die casting, and investment casting are variations. Memory hook: liquid → cavity → solid shape.
铸造是将熔融金属浇入模具。想想蜡烛或青铜雕像。砂型铸造、压铸和熔模铸造是常见的变体。记忆链：液体 → 型腔 → 固态形状。
Forging shapes metal by compressive hammering or pressing, aligning grain flow for strength. Blacksmiths forging swords—heat, beat, repeat. This refines the internal structure, making parts tougher than cast equivalents.
锻造通过锤击或压制的压缩力使金属成形，使晶粒流动对齐以提高强度。铁匠锻剑——加热、锤打、重复。这改善了内部组织，使零件比铸造件更坚韧。
Machining removes material to achieve precise geometry. Turning, milling, drilling—each uses a cutting tool on a workpiece. The lathe rotates the workpiece; the mill rotates the tool. Chips fly, dimensions tighten.
机加工通过去除材料来达到精确几何形状。车削、铣削、钻孔——每种都使用切削刀具作用于工件。车床使工件旋转；铣床使刀具旋转。切屑飞溅，尺寸愈发精确。
Additive manufacturing (3D printing) builds parts layer by layer from a digital model. FDM melts plastic filament; SLA cures resin with a laser. Great for complex internal channels—think of a lattice inside a bracket that can’t be machined.
增材制造（3D 打印）按照数字模型逐层构建零件。FDM 熔融塑料丝材；SLA 用激光固化树脂。特别适合复杂的内部通道——想象一下支架内部的点阵结构，那是机加工无法做到的。
Injection moulding forces molten polymer into a mould cavity at high pressure. It’s the way Lego bricks are made. Short cycle times, high volume. The mould is the negative shape; the part is the positive.
注塑成型在高压下将熔融聚合物射入模具型腔。乐高积木就是这样制造出来的。循环时间短、产量高。模具是凹模，制品是凸形。
8. Energy, Power and Thermodynamics | 能量、功率与热力学
Work done is energy transferred when a force moves its point of application:
W = F × d × cos θ
If the force is parallel to movement, it’s simply force times distance. Think of pushing a crate across a floor.
功是力作用点移动时转移的能量：
W = F × d × cos θ
如果力平行于位移，就是力乘以距离。想象推着板条箱走过地板的情景。
Power is the rate of doing work:
P = W / t
or P = F × v. The watt (J/s) is the unit. High power means energy transfer happens quickly—a sports car versus a bicycle.
功率是做功的速率：
P = W / t
或 P = F × v。单位是瓦特 (J/s)。高功率意味着能量转移迅速——跑车对自行车。
Efficiency is the ratio of useful output energy to total input energy:
η = Output / Input
It is always less than 1 (or 100%) due to losses. Like a phone charger that warms up—some electricity becomes unwanted heat.
效率是有用输出能量与总输入能量之比：
η = 输出 / 输入
由于损耗，它总是小于 1（或 100%）。就像手机充电器会发热一样——部分电能变成了不需要的热能。
The first law of thermodynamics is energy conservation:
ΔU = Q − W
The change in internal energy equals heat added minus work done by the system. In an engine, fuel’s chemical energy becomes heat, then mechanical work.
热力学第一定律是能量守恒：
ΔU = Q − W
内能的变化等于增加的热量减去系统对外做的功。在发动机中，燃料的化学能转化为热量，再转化为机械功。
The second law introduces entropy: heat flows naturally from hotter to cooler bodies. No heat engine can be 100% efficient. Entropy always increases in an isolated system—think of a messy room naturally getting messier.
第二定律引入了熵的概念：热量自然地从高温物体流向低温物体。没有任何热机效率可达 100%。孤立系统的熵总是增加的——想想一个房间会自然变得越来越乱。
9. Systems and Control | 系统与控制
An open-loop system has no feedback; the output is not measured or compared. A simple electric kettle with a timer—it heats for a set time regardless of water temperature. No correction.
开环系统没有反馈；输出不被测量也不被比较。一个带定时器的简单电热水壶——无论水温如何，它只加热设定时间。没有校正。
A closed-loop system uses feedback to reduce error. A thermostat compares room temperature to the set-point and switches the heater accordingly. Memory: ‘closed’ means the loop is connected from output back to input.
闭环系统利用反馈来减少误差。恒温器将室温与设定值比较，并相应地开关加热器。记忆：“闭环”意味着输出端有一条通路连接回输入端。
Transfer function describes the input-output relationship of a system in the Laplace domain. For a simple spring-mass, the TF is a ratio of polynomials. Think of it as a system’s ‘fingerprint’ that predicts behaviour.
传递函数在拉普拉斯域中描述系统的输入-输出关系。对于一个简单的弹簧-质量系统，传递函数是多项式之比。把它看作系统的“指纹”，可以预测系统行为。
PID controller stands for Proportional, Integral, Derivative. P responds to present error, I to past accumulated error, D to predicted future error. Tune these three gains to get fast, stable response.
PID 控制器代表比例 (P)、积分 (I)、微分 (D)。P 响应当前误差，I 响应过去累积的误差，D 响应预测的未来误差。调整这三个增益可获得快速、稳定的响应。
A sensor converts a physical quantity into a signal. A thermocouple produces a tiny voltage proportional to temperature. Actuators do the opposite: an electric motor converts electrical signals into mechanical rotation.
传感器将物理量转换为信号。热电偶产生与温度成比例的微小电压。执行器则相反：电动机将电信号转换为机械旋转。
10. Health and Safety in Engineering | 工程中的健康与安全
Risk assessment systematically identifies hazards, evaluates risks, and decides on control measures. The five steps form the acronym ID-EA-R: Identify hazards, Decide who might be harmed, Evaluate risks, Action to control, Record and review.
风险评估系统地识别危险源、评估风险并决定控制措施。五步法可用首字母 ID-EA-R 来记：识别危险源 (Identify)、确定谁会受伤害 (Decide)、评估风险 (Evaluate)、采取控制行动 (Action)、记录与审查 (Record and review)。
PPE (Personal Protective Equipment) is the last line of defence. Goggles, hard hats, steel-toe boots—these reduce injury if an accident occurs. Remember the hierarchy: elimination first, PPE last.
PPE（个人防护装备）是最后一道防线。护目镜、安全帽、安全靴——一旦发生事故，它们可减轻伤害。记住控制层级：首先消除危险，最后才靠 PPE。
HASAWA (Health and Safety at Work Act) places duties on employers to ensure, so far as is reasonably practicable, the health, safety and welfare of employees. ‘Reasonably practicable’ balances risk against cost, time, and effort—a key legal phrase.
HASAWA（《工作健康与安全法案》）要求雇主在合理可行的范围内确保雇员的健康、安全和福利。“合理可行”意味着在风险与成本、时间和努力之间取得平衡——这是一个关键的法律用语。
Manual handling involves lifting, carrying, pushing or pulling loads. Poor technique causes back injury. The mantra: ‘Bend your knees, not your back, keep the load close.’ Think of a squat lift, not a crane-reach.
人工搬运涉及提举、搬运、推或拉重物。错误的操作方式会导致背部受伤。口诀是：“弯膝不弯腰，重物贴身抱。”想象深蹲式提起，而不是起重机式远伸。
Explosive atmospheres (ATEX) directive covers dust, vapour, or gas that can ignite. Engineering controls include ventilation and spark-proof equipment. The word ‘explosive’ reminds you of the potential for a rapid energy release, so zone classification becomes essential.
爆炸性环境 (ATEX) 指令针对可能被点燃的粉尘、蒸汽或气体。工程控制措施包括通风和防火花设备。“爆炸”一词提醒你存在能量快速释放的潜在危险，因此区域分类至关重要。
Published by TutorHao | Engineering Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
屏轩国际教育cambridge primary/secondary checkpoint, cat4, ukiset,ukcat,igcse,alevel,PAT,STEP,MAT, ibdp,ap,ssat,sat,sat2课程辅导，国外大学本科硕士研究生博士课程论文辅导