📚 Engineering Vocabulary Quick-Memorisation Guide for Year 12 Cambridge | 剑桥12年级工程词汇速记指南
Mastering engineering starts with the language of the discipline. This guide breaks down the core terms from the Cambridge International AS Level Engineering syllabus into bite-sized chunks, pairing each concept with a simple memory hook. Use these English–Chinese mirrored definitions to build confidence and fluency, whether you are reading a specification or sketching a design.
掌握工程学，从掌握学科语言开始。本指南将剑桥国际AS阶段工程课程的核心术语拆解成小块，每个概念都配有一个简单的记忆钩子。使用这些中英对照的定义来建立信心和流利度，无论你是在解读规范还是在绘制设计图。
1. Forces and Moments | 力与力矩
Resultant Force: The single force that produces the same effect on a body as all the original forces combined. Think of it as the "result" of adding up all force vectors like arrows end to end.
合力： 能产生与原所有力共同作用相同效应的单个力。把它想象成将所有力矢量像箭头一样首尾相加得到的“最终结果”。
Equilibrium: A state where the resultant force and resultant moment on a body are both zero. Visualise a perfectly balanced seesaw, with "equal" forces leaving the system "unmoved".
平衡： 作用于物体上的合力和合力矩同时为零的状态。想象一个完全平衡的跷跷板，“相等”的力使系统“不动”。
Moment: g : The turning effect of a force about a pivot, given by M = Fd, where d is the perpendicular distance. "A moment magnifies motion when distance is multiplied."
力矩： 力绕支点的转动效应，公式为 M = Fd，其中 d 是垂直距离。“当距离乘以力，力矩就放大转动效果。”
M = F × d
Couple: A pair of equal and opposite parallel forces that produce rotation without any net translational force. Picture two hands turning a steering wheel—only rotation results.
力偶： 一对大小相等、方向相反且平行但不共线的力，只产生转动而没有净平动。想象两只手转动方向盘——只会引起旋转。
Free-body Diagram: A sketch showing an object isolated from its surroundings, with all forces and moments represented as vectors. "Free" the body from clutter to see forces clearly.
受力图： 将物体从周围环境中隔离出来，用矢量表示所有作用力和力矩的简图。“释放”物体以看清力的作用。
2. Kinematics and Dynamics | 运动学与动力学
Displacement (s): The straight-line distance from start to finish with a given direction. Unlike distance, displacement cares about where you end up, not the path taken.
位移 (s)： 从起点到终点的直线距离，并带有方向。与路程不同，位移只关心终点位置，不关心走过的路径。
Velocity (v): Rate of change of displacement. Its vector nature makes "velocity a very directed speed".
速度 (v)： 位移的变化率。它的矢量性质使“速度是一个有明确方向的速度值”。
Acceleration (a): f velocity, often described by a = (v - u)/t. An object accelerates even when slowing down—this is negative acceleration.
加速度 (a)： 速度的变化率，常用公式 a = (v - u)/t。减速时也有加速度，只是负加速度。
v = u + at
Newton's First Law: An object remains at rest or in uniform motion unless acted upon by a resultant force. Think of it as the "law of reluctance".
牛顿第一定律： 任何物体都要保持匀速直线运动或静止状态，直到合力迫使它改变。可视为“惯性定律”。
Newton's Second Law: F = ma; resultant force equals mass times acceleration. The "force–mass–acceleration family".
牛顿第二定律： F = ma；合力等于质量乘以加速度。“力—质量—加速度铁三角”。
Momentum (p): p = mv. Momentum is "mass in motion". In a closed system, total momentum is conserved, making collisions predictable.
动量 (p)： p = mv。动量是“运动中的质量”。在封闭系统中，总动量守恒，使碰撞结果可预测。
Kinetic Energy (KE): d with motion; the square of velocity shows that speed has a huge impact on stored energy.
动能 (KE)： KE = ½mv²。与运动相关的能量；速度的平方说明速度对储存的能量影响巨大。
3. Material Properties | 材料性能
Stress (σ): Force per unit area within a material, σ = F/A. Imagine the material feeling "stressed" when force spreads over its cross-section.
应力 (σ)： 材料内部单位面积上的力，σ = F/A。想象当力分布在截面上时，材料感受到“压力”。
Strain (ε): th, ε = ΔL/L₀, a dimensionless measure of deformation. Strain tells how much a material is "strained" from its original shape.
应变 (ε)： 伸长量与原长之比，ε = ΔL/L₀，一个无量纲的变形量度。应变说明材料从原形被“拉紧”了多少。
E = σ / ε
Young's Modulus (E): A measure of stiffness, E = σ/ε within the elastic limit. "Young man, you need a stiff spring!" helps recall stiffness.
杨氏模量 (E)： 衡量刚度的指标，在弹性极限内 E = σ/ε。“Young man, 你需要一根硬弹簧！” 帮助记忆刚度。
Elastic Limit: The maximum stress a material can withstand and still return to its original dimensions. Beyond this, the material behaves "like a defeated elastic band".
弹性极限： 材料能承受并仍可恢复原尺寸的最大应力。超过这个点，材料就像“一根失去弹力的橡皮筋”。
Toughness: The ability to absorb energy up to fracture, indicated by area under the stress–strain curve. A tough material "takes a beating" without breaking easily.
韧性： 材料在断裂前吸收能量的能力，由应力-应变曲线下面积表示。韧性材料“抗揍”，不易断裂。
Hardness: Resistance to indentation or scratching. Think of diamonds being "hard to scratch".
硬度： 抵抗压入或刮擦的能力。钻石“硬”得难以刮伤。
Ductility: Ability to be drawn into a wire, a measure of plastic deformation before failure. Ductile materials "duct" into long wires.
延展性： 能被拉成细丝的能力，衡量失效前的塑性变形。延展性材料像“管道”一样被拉长。
4. Material Testing | 材料测试
Tensile Test: A sample is pulled until fracture; yields data for stress–strain curves, yield strength, and UTS. Think of it as a "tug-of-war test for metals".
拉伸试验： 试样被拉直至断裂，获取应力-应变曲线、屈服强度和抗拉强度等数据。就像“金属拔河试验”。
Brinell Hardness Test: A hardened steel ball is pressed into the surface; the indentation diameter indicates hardness. "Brinell's ball leaves a dent and a score."
布氏硬度试验： 用硬钢球压入表面，根据压痕直径得出硬度。“布氏球留下凹痕与数值”。
Charpy Impact Test: A notched bar is struck by a pendulum; energy absorbed gives a measure of toughness. "Charpy's hammer swings to measure backbone."
夏比冲击试验： 摆锤撞击缺口试样，吸收的能量衡量韧性。“夏比的锤子挥来丈量骨气”。
Fatigue Testing: Repeated cyclic loading to determine endurance limit. Remember it as "how long a material can carry repeated stress before it gets tired".
疲劳试验： 重复循环加载以确定耐久极限。记住它是“材料在反复受力‘疲劳’前能撑多久”。
Non-destructive Testing (NDT): Techniques like ultrasonic or dye penetrant that inspect without damaging the part. "No destruction, just detection."
无损检测 (NDT)： 超声波或渗透探伤等技术，在不破坏部件的情况下检测缺陷。“不损坏，只侦探”。
5. Fluid Mechanics | 流体力学
Pressure (P): Force per unit area in a fluid, P = F/A or P = ρgh for a static column. "Pressure pushes in all directions, like a crowd of tiny particles."
压强 (P)： 流体中单位面积上的力，P = F/A 或静液柱 P = ρgh。“压强像一群微小粒子向四面八方推挤”。
P = ρgh
Pascal's Principle: Pressure applied to an enclosed fluid is transmitted undiminished to every point. The hydraulic jack is Pascal's "power multiplier".
帕斯卡原理： 施加在密闭流体上的压强会大小不变地传递到各处。液压千斤顶就是帕斯卡的“力量倍增器”。
Bernoulli's Principle: Where fluid speed increases, pressure decreases. Think of an airplane wing: fast air above lowers pressure, creating lift.
伯努利原理： 流体流速增加时，压强降低。想象飞机机翼：上表面气流快，压强低，产生升力。
Viscosity: A fluid's resistance to flow. Honey has high viscosity; water, low. "Thick fluids are viscous and slow."
粘度： 流体抵抗流动的性质。蜂蜜粘度高，水粘度低。“稠厚流体粘而慢”。
Laminar vs Turbulent Flow: Laminar is smooth and layered; turbulent is chaotic with eddies. "Laminar looks like layers, turbulent is a tantrum."
层流与湍流： 层流平滑分层；湍流杂乱带有涡旋。“层流如千层面，湍流是发脾气”。
6. Thermodynamics | 热力学
Temperature: A measure of the average kinetic energy of particles. It indicates "how hot", not how much thermal energy is stored.
温度： 粒子平均动能的量度。它表示“有多热”，而非储存了多少热能。
Internal Energy: The sum of all kinetic and potential energies of molecules in a substance. "Internal energy is the energy inside, ready to do work or heat."
内能： 物质中所有分子动能与势能的总和。“内能是内在的能量，随时准备做功或传热”。
Specific Heat Capacity (c): Energy needed to raise 1 kg of a material by 1 K, Q = mcΔθ. Materials with high c take "a lot of calories to change their state".
比热容 (c)： 使1 kg材料温度升高1 K所需能量，Q = mcΔθ。高比热容的材料“费很多热量才能升温”。
First Law of Thermodynamics: ΔU = Q - W, energy conservation. "You cannot win; internal energy change equals heat in minus work out."
热力学第一定律： ΔU = Q - W，能量守恒。“你不能赢；内能变化等于吸收热量减去对外作功”。
Entropy (S): A measure of disorder; for an isolated system, entropy increases. "Entropy is the universe's love for mess."
熵 (S)： 无序度的量度；在孤立系统中，熵总是增大。“熵是宇宙对杂乱无章的偏爱”。
7. Electric Circuits | 电路
Current (I): Rate of flow of charge, measured in amperes. Current "counts how many coulombs go by per second".
电流 (I)： 电荷的流动速率，单位为安培。电流“计算每秒通过多少库仑电荷”。
Voltage (V): Electrical potential difference; the "push" that drives current around a circuit. Voltage is like water pressure.
电压 (V)： 电势差；驱动电流流动的“推力”。电压就像水压。
Resistance (R): Opposition to current, R = V/I. A resistor "resists the flow", turning electrical energy into heat.
电阻 (R)： 对电流的阻碍，R = V/I。电阻“抗拒流动”，将电能转化为热。
V = IR
Power (P): P = IV = I²R. Electrical power shows how fast energy is transferred. "More voltage and current means more power."
功率 (P)： P = IV = I²R。电功率表示能量转移的快慢。“电压电流越大，功率越强”。
Kirchhoff's Laws: Junction law: current in equals current out. Loop law: sum of emf equals sum of voltage drops. "Kirchhoff keeps the balance."
基尔霍夫定律： 节点定律：流入电流等于流出电流。回路定律：电动势和等于电压降和。“基尔霍夫保持平衡”。
8. Electronic Principles | 电子学基础
Semiconductor: A material like silicon whose conductivity can be controlled by doping. "Semi-conductor: sometimes a conductor, sometimes not."
半导体： 像硅这样的材料，其导电性可通过掺杂控制。“半导体：时而导电，时而不导电”。
p-n Junction: The boundary where p-type and n-type semiconductors meet, forming a diode. It permits current in one direction only.
p-n 结： p型与n型半导体相遇的界面，形成二极管。它只允许电流单向通过。
Transistor: A three-terminal device used as a switch or amplifier. Think of a small base current controlling a much larger collector current—"transistor as a tiny traffic cop".
晶体管： 三端器件，用作开关或放大器。想象微小基极电流控制大得多的集电极电流——“晶体管是小交警”。
Logic Gate: AND, OR, NOT gates process binary signals. "Gates make decisions: AND both must be 1, OR at least one 1."
逻辑门： 与、或、非门处理二进制信号。“门做决定：AND两者皆1才出1，OR至少一个1即出1”。
Sensor: A component that detects a physical change and produces an electrical signal. A thermistor senses temperature; an LDR senses light.
传感器： 检测物理变化并产生电信号的元件。热敏电阻感知温度；光敏电阻感知光线。
Actuator: A device that takes an electrical signal and produces physical movement, such as a motor or relay. "Actuator acts on command."
执行器： 接收电信号并产生物理运动的装置，如电机或继电器。“执行器奉命行动”。
9. Manufacturing Processes | 制造工艺
Casting: Pouring molten material into a mould to solidify into a shape. "Cast your metal like pouring pancake batter."
铸造： 将熔融材料浇入模具中冷凝成型。“像倒煎饼糊一样铸造金属”。
Machining: Processes like turning, milling, and drilling that remove material with a cutting tool. "Machining chips away the unwanted."
机械加工： 车削、铣削、钻削等用刀具去除材料的工艺。“机械加工把多余的削掉”。
Forming: Bending, forging, or rolling that shapes material without melting, often using plastic deformation. "Forming forces metal into a new form."
成形： 弯曲、锻造、轧制等利用塑性变形而不熔化的成形方式。“成形强制金属获得新形状”。
Additive Manufacturing (3D Printing): Building up a part layer by layer. It is the opposite of machining—"add, not subtract".
增材制造 (3D打印)： 逐层堆叠构建零件。与机加工相反——“增材而非减材”。
Tolerance: The permissible limit of variation in a dimension. "Tolerance defines how much sloppiness a design can tolerate."
公差： 尺寸允许的变动范围。“公差定义设计能容忍多少偏差”。
Surface Finish: The texture and roughness of a machined surface, measured in Ra values. A fine finish means "less friction and better looks".
表面光洁度： 加工表面的纹理和粗糙度，用 Ra 值衡量。良好光洁度意味着“更小摩擦，更好外观”。
10. Engineering Design and Drawing | 工程设计与会图
Orthographic Projection: A method of representing a 3D object in 2D views (front, top, side). "Orthographic shows true shapes without perspective tricks."
正投影： 用二维视图（前、俯、侧）表现三维物体的方法。“正投影展现真实形状，不玩透视花样”。
Isometric Drawing: A pictorial sketch where axes are at 120° to each other, preserving lengths without perspective foreshortening. "Isometric: equal measures along axes."
等距图： 轴间成120°的立体草图，长度不变，无透视缩短。“等距：沿轴等量测量”。
Dimensioning: Adding sizes and relevant notes to a drawing. Good dimensioning "leaves no guesswork" for the manufacturer.
尺寸标注： 在图纸上添加尺寸和相关说明。良好的标注“不给制造商留猜测空间”。
CAD (Computer-Aided Design): Software for creating precise 2D and 3D models. CAD is the digital drafting table.
CAD（计算机辅助设计）： 用于创建精确二维和三维模型的软件。CAD 就是数字绘图板。
Bill of Materials (BOM):
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