📚 Pre-U CIE Engineering: A Quick Memorisation Guide to Key Terminology | Pre-U CIE 工程：关键术语速记指南
Mastering engineering vocabulary is the bedrock of success in the Pre-U CIE Engineering examination. Without a clear command of key terms, you cannot accurately interpret questions, apply principles, or articulate design solutions. This guide is crafted to help you lock in essential terminology through logical groupings, memorable associations, and real‑world contexts. Each section presents a cluster of related terms, explains their meanings concisely, and offers rapid‑recall strategies. By treating terminology as a living toolkit rather than isolated words, you will build the fluency required to tackle any problem with confidence.
精通工程词汇是 Pre-U CIE 工程考试成功的基石。如果对关键术语没有清晰的掌握，你就无法准确解读题目、应用原理或阐明设计方案。本指南旨在通过逻辑分组、助记联想和真实情境，帮助你牢牢掌握基本术语。每个小节集中讲解一组相关术语，简明地解释其含义并提供快速回忆策略。将术语视为有生命的工具箱，而不是孤立的单词，你将培养出应对任何问题所需的自如。
1. Fundamental Concepts in Mechanics | 力学基本概念
Mechanics begins with understanding what a load is — any external force acting on a structure or component. When a load is applied, internal resistance builds up, measured as stress (σ = F / A), which is force per unit area. The resulting deformation is called strain (ε = ΔL / L₀), a dimensionless ratio. To prevent failure, engineers introduce a factor of safety gth / working stress), ensuring the design can handle uncertainties. A clever memory hook: 'Stress causes Strain; Safety stops Snap.' Visualise a rubber band — s stress, stretching shows strain, and knowing its breaking point sets your safety margin.
力学始于理解什么是载荷——作用在结构或部件上的任何外力。施加载荷时，内部会产生抗力，用应力（σ = F / A）来衡量，即单位面积上的力。由此引起的变形称为应变（ε = ΔL / L₀），是一个无量纲比值。为防止失效，工程师引入安全系数（FoS = 极限强度 / 工作应力），确保设计能应对不确定性。一个巧妙的记忆口诀：“应力生应变；安全防折断”。想象一根橡皮筋——拉它产生应力，伸长显示应变，知道它的断裂点就设定了你的安全裕度。
Another critical pair is stiffness and elasticity n to its original shape after unloading. Young’s modulus (E) links them in the elastic region: E = stress / strain. Think of steel as high‑E, high‑stiffness; rubber is low‑E, elastic but not stiff. Recall: 'Stiff springs push back hard; elastic bands snap back.'
另一对关键概念是刚度和弹性。刚度（k = F / δ）量化了部件在给定载荷下抵抗变形的能力，而弹性则是材料在卸载后恢复原始形状的能力。杨氏模量（E）在弹性区域将它们联系起来：E = 应力 / 应变。把钢想象为高 E、高刚度；橡胶是低 E、有弹性但不刚硬。记忆法：“硬弹簧强力回弹；橡皮筋迅速复原”。
2. Material Properties and Smart Associations | 材料性能与巧妙联想
Materials are chosen by matching properties to function. Hardness is resistance to surface indentation or scratching — diamond is hard, chalk is not. Toughness, however, is the ability to absorb energy without fracturing; it combines strength and ductility. Use the image of a hammer: a hard surface resists a dent, while a tough material withstands the blow without shattering. A simple mnemonic: 'Hard to scratch; Tough to crack.'
材料的选择是根据性能与功能相匹配。 硬度是抵抗表面压痕或划伤的能力——金刚石硬，粉笔不硬。而韧性则是吸收能量而不断裂的能力；它结合了强度与延展性。想象一把锤子：硬表面能抵抗凹痕，而韧材料能承受冲击不碎裂。一个简单的助记：“硬度抗划；韧性抗裂”。
Ductility and malleability are often confused. Ductility refers to the ability to be drawn into wires (plastic deformation under tension), while malleability is the capacity to be shaped by compression, for example hammering into thin sheets. Copper shows both, but gold is supremely malleable. Think: 'Ductile is Drawn; Malleable is Mashed.' The keyword 'Brittle' sits opposite — a brittle material like glass breaks with little plastic deformation. When revising, draw a two‑axis chart: strength vs. ductility, and place common materials: ceramics are strong but brittle; mild steel is moderately strong and very ductile.
延展性与可锻性经常被混淆。延展性指被拉伸成丝的能力（拉伸下的塑性变形），而可锻性是通过压缩成形（例如锤成薄片）的能力。铜兼具两者，而金具有极高的可锻性。记住：“延展可拉丝；可锻可锤压”。关键词“脆性”则是其反面——像玻璃这样的脆性材料在很少的塑性变形下就会断裂。复习时，画一个二维图表：强度对延展性，把常见材料标上：陶瓷强度高但脆；低碳钢强度中等但延展性很好。
3. Forces, Moments and Equilibrium | 力、力矩与平衡
A force is a push or pull, expressed in newtons (N). Moment ibrium requires both translational balance (ΣF = 0) and rotational balance (ΣM = 0). A see‑ e product of weight and distance from the centre is equal on both sides. The memory trick: 'For balance, sum forces to zero, sum moments also zero.'
力是推力或拉力，单位为牛顿（N）。力矩（M = F × d）衡量力绕支点的转动效果，其中 d 是从支点到力作用线的垂直距离。平衡需要移动平衡（ΣF = 0）和转动平衡（ΣM = 0）。翘翘板完美地诠释了这一点：当两边孩子体重与距中心距离的乘积相等时，就达到了平衡。记忆窍门：“要平衡，力之和归零，力矩之和也归零”。
Master couple and torque next. A couple consists of two equal, opposite, parallel forces that produce pure rotation without translation. Torque is the moment generated, often used for rotating shafts. Think of turning a steering wheel — your hands apply a couple. In free‑body diagrams, always identify reaction forces at supports; rollers provide vertical reactions, pins provide two components, and fixed supports add a moment reaction. Use the phrase: 'Pin has two, Roller one, Fixed gives bit more fun (moment).'
接下来要掌握力偶和扭矩。力偶由两个大小相等、方向相反、彼此平行的力组成，产生纯转动而不平移。扭矩就是所产生的力矩，常用于转轴。想象转动方向盘——你的双手施加的就是力偶。在受力图中，务必标出支点处的反力；滚轴提供垂直反力，铰链提供两个分量，固定端还提供反力矩。用一句话记忆：“铰链二、滚轴一、固定端多一个力矩”。
4. Electrical Essentials: V, I, R and Beyond | 电气基础：V、I、R 及延伸
Electricity is the flow of charge. Voltage (V) is the 'electrical pressure' measured in volts. Current (I) is the rate of charge flow in amperes, and resistance cornerstone. A powerful analogy is water in a pipe: voltage is pressure, current is flow rate, and resistance is pipe friction. If you squeeze the pipe (increase resistance), flow drops for the same pressure. To lock it in: 'V over I times R — very important rule.'
电是电荷的流动。电压（V）是以伏特为单位的“电压强”。电流（I）是以安培为单位的电荷流动速率，电阻（R）是对电流的阻碍，单位是欧姆。欧姆定律（V = IR）是基础。一个有力的类比是水管中的水流：电压如同水压，电流如同流量，电阻如同水管摩擦。如果夹紧水管（增加电阻），在相同压力下流量会下降。牢记：“V 等于 I 乘 R——非常重要的法则”。
: P = IV = I²R = V²/R. A resistor rated at 1/4 W will overheat if you push 1 W through it. Kirchhoff’s laws complete circuit analysis: Kirchhoff’s Current Law (KCL) says the sum of currents entering a node equals the sum leaving; Kirchhoff’s Voltage Law (KVL) states that the sum of voltages around any closed loop is zero. Think 'What goes in must come out' for KCL, and 'Voltage ups must match voltage downs' for KVL. Capacitance (C = Q/V) stores energy in an electric field, while inductance (L) stores it in a magnetic field. Pair these opposites: 'Capacitor blocks steady voltage, inductor maintains steady current.'
功率（P）是能量转换的速率：P = IV = I²R = V²/R。额定 1/4 W 的电阻如果通过的功率到 1 W 就会过热。基尔霍夫定律完善了电路分析：基尔霍夫电流定律（KCL）说流入节点的电流之和等于流出之和；基尔霍夫电压定律（KVL）指出，任意闭合回路中电压升之和等于电压降之和。对 KCL 记住“进多少，出多少”，对 KVL 记住“电压升必等于电压降”。电容（C = Q/V）在电场中储存能量，而电感（L）在磁场中储存能量。这一对的反义词帮你记忆：“电容阻稳恒电压，电感激稳恒电流”。
5. Mechanical Systems: Gears to Hydraulics | 机械系统：从齿轮到液压
Mechanisms change force, speed, or direction of motion. A lever e: mechanical advantage (MA = load / effort) tells how much the input force is multiplied. Velocity ratio (VR) compares distances moved by effort and load. Efficiency is η = (MA / VR) × 100%. For gears, the gear ratio is the ratio of teeth numbers: driven/driver. A small driving gear (pinion) turning a larger driven gear decreases speed but increases torque. Remind yourself: 'Big gear turns slow but strong.'
机构改变力、速度或运动方向。杠杆放大力量：机械效益（MA = 负载 / 驱动力）表明输入力被放大了多少倍。速比（VR）比较驱动力与负载移动的距离。效率为 η = (MA / VR) × 100%。对于齿轮，齿轮比是齿数之比：从动轮 / 主动轮。一个小主动齿轮（小齿轮）带动大从动齿轮会降低转速但增加转矩。提醒自己：“大齿轮转得慢但力气大”。
Pulleys and belts transmit power between shafts. The tension ratio in a V‑belt drive determines torque capacity. Hydraulic systems a small piston can lift a large load on a big piston (F₁/A₁ = F₂/A₂). The formula stroke: 'Pressure same, force favours area.' In pneumatics, compressed air provides similar advantages but is more compressible, giving 'cushioned' motion. Link them: 'Hydraulics are incompressible—firm and strong; pneumatics are compressible—soft and fast.'
滑轮与皮带在轴间传递动力。V 形带的张力比决定了扭矩容量。液压系统运用帕斯卡原理：施加于密闭流体的压力会等量传递，因此小活塞上的小力能举起大活塞上的大负载（F₁/A₁ = F₂/A₂）。口诀：“压力相同，力青睐面积”。在气动系统中，压缩空气提供类似好处，但空气更可压缩，产生“缓冲”运动。联系起来记忆：“液压不可压缩——刚劲有力；气动可压缩——柔软快速”。
6. Energy, Work and Thermodynamic Laws | 能量、功与热力学定律
Work (W = F × s) is done when a force moves its point of application. Energy ernal energy (U), and more. The First Law of Thermodynamics is energy conservation: ΔU = Q – W, where Q is heat added to the system and W is work done by the system. Use the mnemonic: 'You (U) gain when heat (Q) comes in or work (W) stays in.' Sign conventions matter: 'Increases energy? Q positive, W negative from system’s viewpoint.'
功（W = F × s）是力移动其作用点时所做。 能量是做功的能力；它包括动能（KE = ½mv²）、势能（PE = mgh）、内能（U）等。热力学第一定律即能量守恒：ΔU = Q – W，其中 Q 是加入系统的热量，W 是系统对外做的功。用口诀记忆：“热量进、做功内，内能增”。正负号惯例很重要：“增加能量？从系统的角度看，Q 正、W 负”。
Thermal terms: Specific heat capacity (c) is energy to raise 1 kg by 1 K; Q = mcΔθ. Latent heat is energy needed for phase change without temperature change (L = Q/m). The Second Law introduces entropy — heat cannot spontaneously flow from cold to hot, and no engine is 100% t. Think of a cup of tea cooling: energy disperses. For efficiency of a heat engine: η = 1 – (Tcold / Thot), temperatures in kelvin. To boost efficiency, widen the temperature gap. Simple reminder: 'Hotter source, colder sink gives more work from your heat.'
热学名词：比热容（c）是 1 kg 物质升高 1 K 所需的能量；Q = mcΔθ。潜热是相变时所需而不改变温度的能量（L = Q/m）。第二定律引入熵——热量不能自发从冷处流向热处，而且任何热机效率都不可能达到 100%。想象一杯茶变凉：能量散逸。对于热机效率：η = 1 – (T_冷 / T_热)，温度用开尔文。要提高效率，拉大温差。简单提醒：“热源更热，冷源更冷，产出功更多”。
7. Fluid Mechanics: Pressure to Bernoulli | 流体力学：从压力到伯努利
Fluid behaviour underlies pumps, aeroplanes, and pipelines. Pressure ssure is pressure relative to atmosphere; absolute pressure = gauge + atmospheric. Archimedes’ principle states that the upthrust on a submerged body equals the weight of fluid displaced. For buoyancy: 'Float when weight displaced equals own weight.'
流体的行为是水泵、飞机和管道的基础。压力（p = F/A）在静止流体中随深度增加：p = ρgh，其中 ρ 是密度，g 是重力加速度，h 是深度。这就是坝底更厚的原因。表压是相对于大气压的压力；绝对压力 = 表压 + 大气压。阿基米德原理说明，浸没物体所受的浮力等于排开流体的重量。浮力记忆：“排开重量等于自身重量就漂浮”。
For flowing fluids, Bernoulli’s equation mline) expresses conservation of energy. In a horizontal pipe, an increase in velocity means a drop in pressure — is is how a carburettor draws fuel and how an aerofoil generates lift. A phrase to recall: 'Fast flow, low pressure.' Viscosity flow is laminar or turbulent. Low Re → smooth layers; high Re → chaotic eddies. Associate: 'Low Reynolds, Laminar, Layers stay; High Reynolds, Disorder rules.'
对于流动的流体，伯努利方程（p + ½ρv² + ρgh = 常数，沿一条流线）表达了能量守恒。在水平管中，速度增加意味着压力下降——这就是文丘里效应。化油器就是这样吸油的，翼型也是这样产生升力的。记住一句话：“流速快，压力低”。黏度是流体的内摩擦；蜂蜜黏度高，水黏度低。雷诺数（Re = ρvd/μ）可预测流动是层流还是湍流。Re 低 → 平整层流；Re 高 → 混乱漩涡。联想：“低雷诺，层流层不混；高雷诺，湍流一团糟”。
8. Manufacturing Processes: Shaping and Joining | 制造工艺：成形与连接
Manufacturing terminology covers how parts are produced. Casting involves pouring molten material into a mould; sand casting is common for large parts, die casting for high‑volume metal components. Forging shapes metal by compressive forces, often hot, improving grain structure and strength. Machining removes material using tools like lathe (turning), milling cutter, or drill. A key term is feed rate and cutting speed. Visualise: 'Casting pours, Forging pounds, Machining carves.'
制造术语涵盖零件如何被生产出来。铸造是将熔融材料倒入模具；砂型铸造常用于大件，压力铸造用于大批量金属零件。锻造通过压缩力（常常热态）使金属成形，改善晶粒结构并提高强度。机械加工用刀具去除材料，如车床（车削）、铣刀或钻头。关键术语是进给率和切削速度。形象记忆：“铸造是浇，锻造是砸，加工是削”。
Welding joins materials by fusion with or without a filler; types include MIG (metal inert gas) and TIG (tungsten inert gas). Soldering and brazing join without melting the base metals; brazing occurs at higher temperatures than soldering. Additive manufacturing (3D printing) builds parts layer by layer, enabling complex geometries impossible by subtractive methods. Process selection depends on tolerance, surface finish, and cost. Quick recall: 'Weld melts parent metal, solder glues surfaces.' For digital manufacturing, remember 'Additive adds, Subtractive removes.'
焊接通过熔化结合材料，可加或不加填充料；类型包括 MIG（金属惰性气体焊）和 TIG（钨极惰性气体焊）。锡焊和钎焊连接时不熔化母材；钎焊温度高于锡焊。增材制造（3D 打印）逐层建造零件，能实现减材方法无法做到的复杂几何形状。工艺选择取决于公差、表面光洁度和成本。快速回忆：“焊接熔母材，锡焊粘表面”。对于数字制造，记住“增材增加，减材去除”。
9. Quality, Tolerance and Measurement | 质量、公差与测量
Quality in engineering is about conformance to specification. Tolerance is the permissible limit of variation in a dimension, e.g. 50 ±0.1 mm. Accuracy is how close a measurement is to the true value; precision is the repeatability of measurements, regardless of their closeness to the truth. A target analogy: precise shots are tightly grouped; accurate shots are centred on the bullseye. The mnemonic: 'Precision is about consistency, accuracy about correctness.'
工程中的质量是指符合规范。公差是尺寸可容许的变动范围，例如 50 ±0.1 mm。准确度是测量结果接近真实值的程度；精密度是测量的可重复性，不论它们是否接近真值。靶子类比：精密的射击弹着点紧密成团；准确的射击弹着点集中在靶心。助记：“精密度关乎一致性，准确度关乎正确性”。
Calibration is comparing an instrument against a known standard to correct errors. A vernier caliper typically reads to 0.02 mm; a micrometer to 0.01 mm or finer. Go/No‑Go gauges quickly check if a part meets tolerance limits without measuring absolute size. Statistical process control (SPC) uses control charts to monitor variability. When describing inspection, distinguish non‑destructive testing (NDT) — such as ultrasonic or dye penetrant — from destructive tests like tensile tests. Key phrase: 'NDT finds flaws without wrecking the part.'
校准是将仪器与已知标准比对以纠正误差。游标卡尺通常读数到 0.02 mm；千分尺可读至 0.01 mm 或更精细。通/止规能快速检查零件是否满足公差要求，无需测量绝对尺寸。统计过程控制（SPC）使用控制图监控变差。描述检测时，要区分无损检测（NDT）——如超声波或染料渗透——与破坏性测试如拉伸试验。关键词：“无损检测找缺陷，不破坏零件”。
10. Engineering Drawing and CAD Literacy | 工程图纸与 CAD 素养
Drawings are the universal language of engineering. Orthographic projection shows the object from multiple 2D views (front, top, side), usually in third‑angle (symbol: truncated cone with circle to the right). Isometric drawing represents a 3D object with axes at 120°, showing three faces without perspective. Remember the difference: 'Ortho gives true shapes and sizes; Iso gives a single 3D‑like view.' Sectional views reveal internal features by imagining a cutting plane; hatching lines indicate solid material cut through.
图纸是工程界的通用语言。正交投影从多个二维视图（前、顶、侧）展示物体，通常采用第三角画法（符号：截锥，圆圈在右侧）。等轴测图用互成 120° 的轴线表现三维物体，展示三个面且无透视缩短。记住区别：“正交给出真实形状与尺寸；等轴测给出单一三维感视图”。剖视图通过假想的剖切面揭示内部结构；剖面线表示被切到的实体材料。
CAD (Computer‑Aided Design) has transformed drafting. Parametric modellers (like SolidWorks) use dimensions and constraints to define geometry; changing a dimension updates the part instantly. CAM (Computer‑Aided Manufacturing) converts CAD models into toolpaths for CNC machines. BOM (Bill of Materials) lists every component with part numbers and quantities. Use the link: 'CAD designs, CAM makes, BOM lists.' Conventions such as line types (continuous thick for visible outlines, dashed for hidden detail, chain for centre lines) must be memorised. A simple rhyme: 'Thick for what you see, dashes for the underneath, chain to mark the centre’s wreath.'
CAD（计算机辅助设计）改变了绘图方式。参数化建模器（如 SolidWorks）使用尺寸和约束来定义几何；更改尺寸会自动更新零件。CAM（计算机辅助制造）将 CAD 模型转换为数控机床的刀具路径。BOM（物料清单）列出每个零件及其编号和数量。串起关系：“CAD 设计，CAM 制造，BOM 列清单”。约定如线型（粗实线为可见轮廓，虚线为隐藏细节，单点画线为中心线）必须牢记。一个简单的韵文：“实线见轮廓，虚线藏下头，中心用长点构”。
11. Digital Systems and Control Terminology | 数字系统与控制术语
Modern engineering integrates electronics with control. A sensor (e.g. thermistor, LDR) detects a physical change and outputs an electrical signal. An actuator (e.g. motor, solenoid) converts electrical energy into motion or action. In between sits a microcontroller or PLC that processes inputs and triggers outputs based on logic or a feedback loop. Open‑loop control simply follows a command (like a toaster timer); closed‑loop uses feedback (a thermostat) to maintain a set point. A phrase: 'Sensor sees, controller thinks, actuator acts.'
现代工程将电子学与控制融为一体。传感器（如热敏电阻、光敏电阻）检测物理变化并输出电信号。执行器（如电机、电磁铁）将电能转化为运动或动作。中间有微控制器或 PLC 处理输入，并根据逻辑或反馈环触发输出。开环控制只依指令执行（如吐司炉定时器）；闭环控制使用反馈（如恒温器）来维持设定点。一句话：“传感器感知，控制器思考，执行器动作”。
Key terms: ADC (Analog‑to‑Digital Converter) turns a varying voltage into a binary number; PWM (Pulse Width Modulation) controls power by switching a signal on and off rapidly — used in motor speed control and LED dimming. Boolean algebra and logic gates (AND, OR, NOT) form the foundation of decision circuits. For revision, practise identifying transducers: 'Input transducers turn a physical quantity into electricity, output transducers do the reverse.'
关键术语：ADC（模数转换器）将变化的电压转成二进制数；PWM（脉宽调制）通过快速开关信号来控制功率——用于电机调速和 LED 调光。布尔代数和逻辑门（与、或、非）构成决策电路的基础。复习时，练习辨别换能器：“输入换能器把物理量变成电，输出换能器相反”。
12. Exam‑Day Vocabulary Tactics | 考试日词汇策略
In the exam, precise terminology demonstrates depth. When describing a failure, use yielding for permanent deformation, fatigue for crack growth under cyclic loading, and creep for slow deformation at high temperature over time. Photocopy‑style definitions cost marks; instead, link terms to graphs — a stress–strain curve tells you where limit of proportionality, yield point, and ultimate tensile strength lie. Draw little sketches in your mind: a steep elastic line, a flat bit at yield, then a peak before breaking.
在考试中，精确的术语展示深度。描述失效时，用屈服表示永久变形，用疲劳表示循环载荷下裂纹扩展，用蠕变表示高温下随时间缓慢变形。教科书式的定义会丢分；相反，把术语与曲线图联系起来——应力-应变曲线上标出了比例极限、屈服点和极限抗拉强度的位置。在脑海中画小图：一段陡直的弹性线，屈服处变平，然后在断裂前出现峰值。
Always use standard symbols and units: force
Published by TutorHao | Pre-U 工程 Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
或截图后用「扫一扫 → 相册」选择本图