📚 IGCSE CCEA Engineering: Vocabulary & Terminology Quick Memorisation Guide | IGCSE CCEA 工程：词汇术语速记指南
Engineering has its own language. Mastering the essential terms in the CCEA IGCSE Engineering specification is the first step towards confidently answering exam questions, interpreting technical drawings, and understanding manufacturing processes. This guide groups key vocabulary into logical categories, provides clear definitions, and offers memory hooks to help you recall each term under pressure. Use it as your daily companion while working through theory, practical tasks, and past papers.
工程学有自己的语言。掌握 CCEA IGCSE 工程课程大纲中的基本术语，是自信地回答考试题目、解读技术图纸以及理解制造过程的第一步。本指南将关键词汇按逻辑类别分组，提供清晰的定义，并给出记忆钩子，帮助你在压力下回忆起每个术语。你可以将它当作日常伴侣，在学习理论、完成实践任务和练习历年真题时使用。
1. Materials & Their Properties | 材料及其性能
Ferrous metals contain iron and are generally magnetic, with examples like mild steel and cast iron. Mild steel is ductile and widely used in structural work, while cast iron is brittle but excellent under compression. A quick memory hook: ‘Ferrous = Fe (iron)’. Non-ferrous metals do not contain iron; examples include aluminium (lightweight, corrosion-resistant) and copper (excellent conductor). Remember ‘Non-ferrous = No iron’. Alloys are mixtures of two or more elements, at least one being a metal. Brass (copper + zinc) and stainless steel (iron + chromium + nickel) are common alloys that improve specific properties like corrosion resistance or strength.
黑色金属 含铁，通常具有磁性，例如低碳钢和铸铁。低碳钢具有延展性，广泛用于结构工程；铸铁虽然脆，但抗压性能优异。记忆钩子：’Ferrous = Fe（铁）’。有色金属 不含铁；例子包括铝（轻质、耐腐蚀）和铜（优良导体）。记住：’Non-ferrous = 无铁’。合金 是由两种或以上元素组成的混合物，其中至少有一种是金属。黄铜（铜+锌）和不锈钢（铁+铬+镍）是常见的合金，它们改进了特定的性能，如耐腐蚀性或强度。
Hardness is a material’s resistance to indentation or scratching. Toughness describes the ability to absorb energy without fracturing. Ductility is how much a material can be stretched into a wire, while malleability refers to being hammered or rolled into thin sheets. Think of copper: it is both ductile and malleable. Elasticity is the ability to return to original shape after load removal; plasticity means permanent deformation. Density is mass per unit volume (kg/m³). A practical way to recall: ‘Tough things bend; hard things resist scratching.’
硬度 指材料抵抗压痕或划痕的能力。韧性 描述材料在断裂前吸收能量的能力。延展性 是材料能被拉成细丝的程度，而可锻性 指的是能被锤打或轧制成薄板。想一想铜：它既有延展性也有可锻性。弹性 是去除载荷后恢复原状的能力；塑性 则意味着永久变形。密度 是单位体积的质量（千克/立方米）。实用的记忆方法：’韧性的东西会弯曲；硬的东西抗刮擦。’
2. Manufacturing Processes | 制造工艺
Casting involves pouring molten metal into a mould cavity and letting it solidify. Sand casting is common for large parts; die casting uses permanent metal moulds for high-volume production. Think ‘cast = shape from liquid’. Forming changes the shape of a solid workpiece without adding or removing material. Forging hammers or presses metal into shape while hot, refining grain structure and improving strength. Rolling passes metal between rollers to reduce thickness; extrusion pushes material through a die to create long profiles with uniform cross-section. ‘Extrude like toothpaste’ is a helpful image.
铸造 是将熔融金属倒入模具型腔并使其凝固的工艺。砂型铸造常用于大型零件；压力铸造使用永久性金属模具进行大批量生产。想一下：’铸 = 从液体成形’。成形 是在不添加或去除材料的情况下改变固体工件的形状。锻造 在加热状态下通过锤打或压制使金属成形，能细化晶粒结构并提高强度。轧制 是将金属通过轧辊之间以减小厚度；挤压 是将材料推过一个模具，以制造具有均匀截面的长条型材。’像挤牙膏一样挤压’ 是一个有用的图像。
Machining removes material using cutting tools. Turning rotates the workpiece while a single-point tool cuts; performed on a lathe. Milling uses a rotating multi-tooth cutter to remove material; the workpiece is fed into the cutter. Drilling creates holes using a rotating drill bit. Welding joins materials by melting and fusing them, often with a filler rod. Brazing and soldering use a filler metal with a lower melting point than the base metals; brazing happens above 450 °C, soldering below. A simple mnemonic: ‘Brazing is hotter, soldering is for electronics.’ Adhesive bonding uses glue; mechanical joining uses screws, bolts, rivets.
机械加工 使用切削刀具去除材料。车削 旋转工件，同时用单点刀具切削；在车床上进行。铣削 使用旋转的多齿刀具去除材料；工件向刀具进给。钻削 使用旋转的钻头加工孔。焊接 通过熔化和融合来连接材料，通常使用填充棒。钎焊 和软钎焊 使用熔点低于母材的填充金属；钎焊温度在 450 °C 以上，软钎焊在以下。简单的记忆法：’钎焊更热，软钎焊用于电子设备。’粘合剂连接 使用胶水；机械连接使用螺钉、螺栓、铆钉。
3. Mechanical Systems & Mechanisms | 机械系统与机构
Lever: a rigid bar pivoted at a fulcrum, used to multiply force or distance. Three classes exist; class 1 has fulcrum between effort and load (seesaw), class 2 has load in the middle (wheelbarrow), class 3 has effort in the middle (tweezers). Linkage: a system of rigid links connected by joints to transfer motion and force. A four-bar linkage is common. Gear: toothed wheels that transmit torque and change speed, direction, or axis of rotation. Gear ratio = number of teeth on driven gear / number of teeth on driver gear. A small driver turning a large driven gear multiplies torque but reduces speed.
杠杆：绕支点转动的刚性杆，用于放大力或距离。存在三类杠杆；第 1 类支点在施力和负载之间（跷跷板），第 2 类负载在中间（手推车），第 3 类施力在中间（镊子）。连杆机构：由铰链连接的刚性连杆组成的系统，用于传递运动和力。四杆机构很常见。齿轮：带有轮齿的轮子，用于传递扭矩并改变速度、方向或旋转轴线。齿轮比 = 从动齿轮齿数 / 主动齿轮齿数。小齿轮带动大从动齿轮可以放大扭矩但降低速度。
Belt drive uses a belt running over pulleys; it can slip and is quiet. Chain drive uses a chain and sprockets; no slip, positive drive, used in bicycles. Cam and follower: a cam rotates, and a follower rides on its profile to produce reciprocating motion. Crank and slider converts rotary to linear motion (engine piston). Pneumatics use compressed air; hydraulics use pressurised liquid. Hydraulic systems can generate huge forces due to the incompressibility of fluids. A formula to remember: Pressure = Force / Area (P = F/A). In a hydraulic jack, a small force on a small piston creates high pressure that moves a larger piston with greater force.
带传动 使用在带轮上运行的皮带；它可以打滑并且安静。链传动 使用链条和链轮；无滑动，适合自行车等强制传动。凸轮与从动件：凸轮旋转，从动件沿其轮廓运动以产生往复运动。曲柄滑块机构 将旋转运动转换为直线运动（发动机活塞）。气动 使用压缩空气；液压 使用加压液体。由于液体的不可压缩性，液压系统可以产生巨大的力。记住公式：压力 = 力 / 面积 (P = F/A)。在液压千斤顶中，小活塞上的小力产生高压力，推动较大的活塞以更大的力移动。
4. Forces, Motion & Energy | 力、运动与能量
Force is a push or pull measured in newtons (N). Mass is the amount of matter (kg); weight is the gravitational force on mass (N). Weight = mass × gravitational field strength (W = m × g, g ≈ 10 m/s² on Earth). Centre of gravity is the point where the whole weight appears to act. Equilibrium means net force and net moment are zero. Moment (turning effect) = force × perpendicular distance from pivot (M = F × d). To increase a moment, increase force or its distance from the pivot.
力 是推或拉，以牛顿（N）计量。质量 是物体所含物质的量（kg）；重量 是作用在质量上的重力（N）。重量 = 质量 × 重力场强度（W = m × g，地球上 g ≈ 10 m/s²）。重心 是整个重量似乎作用的点。平衡 意味着合力和合力矩为零。力矩（转动效应）= 力 × 到支点的垂直距离（M = F × d）。要增大力矩，可以增加力或增加力到支点的距离。
Work done = force × distance moved in direction of force (W = F × d), in joules (J). Power is the rate of doing work (P = W/t or P = F × v), in watts (W). Energy exists in many forms: kinetic (movement), gravitational potential, elastic potential, thermal, chemical, electrical. The principle of conservation of energy states energy cannot be created or destroyed, only transferred. Efficiency = useful output / total input, often expressed as a percentage. In engineering, friction often wastes energy as heat.
做功 = 力 × 在力的方向上移动的距离（W = F × d），单位焦耳（J）。功率 是做功的速率（P = W/t 或 P = F × v），单位瓦特（W）。能量 存在多种形式：动能（运动）、重力势能、弹性势能、热能、化学能、电能。能量守恒定律指出能量不能被创造或毁灭，只能转移。效率 = 有用输出 / 总输入，通常以百分比表示。在工程中，摩擦常常以热的形式浪费能量。
5. Engineering Drawing & Communication | 工程制图与交流
Orthographic projection shows a 3D object through 2D views (usually front, top, side) aligned correctly. In third-angle projection (common in UK/CEE), the right view is placed to the right of the front view. Isometric drawing is a pictorial 3D representation with axes at 30° to the horizontal, without perspective. Sectional views reveal internal details by cutting through the part; hatching indicates cut surfaces. Dimensioning must be clear: extension lines, dimension lines, and values in millimetres. Avoid redundant dimensions. Tolerance is the allowable variation from a nominal size, e.g., 25 ±0.1 mm.
正投影 通过正确对齐的二维视图（通常是前视图、俯视图和侧视图）来表示三维物体。在第三角投影中（英国/CCEA 常见），右视图放在前视图的右侧。等轴测图 是一种无透视的图示性三维表示法，轴线与水平线成 30° 角。剖视图 通过切割零件揭示内部细节；剖面线表示切割表面。尺寸标注 必须清晰：尺寸界线、尺寸线以及以毫米为单位的数值。避免冗余尺寸。公差 是相对于公称尺寸允许的变动范围，例如 25 ±0.1 毫米。
CAD (Computer-Aided Design): software for creating precise 2D and 3D models. CAM (Computer-Aided Manufacture) uses software to control machine tools; G-code translates CAD paths into machine movements. Rapid prototyping (3D printing) builds layers additively from a CAD model. Block diagram: simplified representation of a system using labelled blocks and arrows to show signal/energy flow. Flowchart uses symbols (start/end, process, decision) to map a sequence of operations or logic. Schematic diagram shows electrical or fluid circuit connections using standard symbols (resistors, pumps, valves).
CAD（计算机辅助设计）：用于创建精确的二维和三维模型的软件。CAM（计算机辅助制造） 使用软件控制机床；G 代码将 CAD 刀具路径转化为机器动作。快速原型制造（3D 打印）从 CAD 模型逐层叠加构建零件。框图：使用带标签的方框和箭头显示信号/能量流动的系统简化表示。流程图 使用符号（开始/结束、处理、决策）来映射操作顺序或逻辑。原理图 使用标准符号（电阻器、泵、阀门）显示电气或流体回路的连接。
6. Electronics & Control Systems | 电子与控制系统
Voltage (V) is electrical pressure (potential difference) pushing current, measured in volts. Current (I) is the flow of electric charge, measured in amperes (A). Resistance (R) opposes current, measured in ohms (Ω). Ohm’s law: V = I × R. Power (P) in an electric circuit: P = V × I, in watts. Resistor: fixed or variable (potentiometer, thermistor, LDR). A thermistor changes resistance with temperature (NTC – negative temperature coefficient: resistance falls as temperature rises). An LDR (light-dependent resistor) decreases resistance in bright light.
电压（V） 是推动电流的电压力（电位差），以伏特计量。电流（I） 是电荷的流动，以安培（A）计量。电阻（R） 阻碍电流，以欧姆（Ω）计量。欧姆定律：V = I × R。电功率（P）：P = V × I，单位瓦特。电阻器：固定或可变的（电位器、热敏电阻、光敏电阻）。热敏电阻的电阻随温度变化（NTC——负温度系数：温度升高电阻下降）。LDR（光敏电阻）在亮光下电阻减小。
Diode allows current to flow in one direction only; an LED (light-emitting diode) emits light when forward-biased. Transistor can act as a switch or amplifier; in a simple circuit, a small base current controls a larger collector-emitter current. Capacitor stores charge; useful in timing circuits. Integrated circuit (IC): contains many components on a single chip, e.g., 555 timer. Sensor detects physical changes (temperature, light, moisture) and outputs a signal. Actuator produces an action (motor, solenoid, buzzer). Open-loop control has no feedback (e.g., toaster); closed-loop uses feedback to adjust output (thermostat).
二极管 只允许电流单向流动；LED（发光二极管）在正向偏置时发光。晶体管 可用作开关或放大器；在简单电路中，小的基极电流控制较大的集电极-发射极电流。电容器 存储电荷；在定时电路中有用。集成电路（IC）：在单个芯片上包含许多元件，例如 555 定时器。传感器 检测物理变化（温度、光、湿度）并输出信号。执行器 产生动作（电机、螺线管、蜂鸣器）。开环控制 无反馈（如烤面包机）；闭环控制 使用反馈来调整输出（如恒温器）。
7. Structural Engineering & Loads | 结构工程与荷载
Tension pulls and stretches a member; compression pushes and shortens it. Shear forces act parallel and opposite across a cross-section, tending to cut. Torsion is twisting. Bending combines tension on one side and compression on the other. A beam experiences bending when loaded transversely. Strut: a member in compression; tie: a member in tension. In a simple frame, tie = thin cable; strut = thick bar. Dead load is permanent, like the weight of the structure itself. Live load is variable, such as people, furniture, vehicles. Factor of safety = failure load / design load; typical values range from 2 to 5.
拉伸 将构件拉长；压缩 将构件推短。剪切 力在横截面上平行且相反作用，倾向于切割。扭转 是扭曲。弯曲 在一侧产生拉伸，另一侧产生压缩。梁在受到横向荷载时会发生弯曲。压杆：受压构件；拉杆：受拉构件。在简单框架中，拉杆 = 细缆；压杆 = 粗杆。恒载 是永久性的，如结构自身的重量。活载 是可变动的，如人员、家具、车辆。安全系数 = 破坏荷载 / 设计荷载；典型值在 2 到 5 之间。
8. Quality, Testing & Standards | 质量、测试与标准
Quality assurance (QA) is process-oriented, ensuring procedures are in place to prevent defects. Quality control (QC) is product-oriented, involving inspection and testing of finished items. Non-destructive testing (NDT) checks for defects without damaging the part: visual inspection, dye penetrant, ultrasonic, X-ray. Destructive testing: tensile testing (measures UTS – ultimate tensile strength), impact testing (toughness), hardness testing (Brinell, Rockwell). Calibration ensures instruments give accurate readings by comparing with a known standard.
质量保证（QA） 是过程导向的，确保有程序防止缺陷。质量控制（QC） 是产品导向的，涉及对成品的检查和测试。无损检测（NDT） 检查缺陷而不损坏零件：目视检查、染料渗透、超声波、X 射线。破坏性测试：拉伸测试（测量 UTS——极限抗拉强度）、冲击测试（韧性）、硬度测试（布氏、洛氏）。校准 通过与已知标准比较，确保仪器给出准确读数。
British Standards (BS) and ISO set requirements for products and processes to ensure safety and interoperability. Tolerance is the permissible limit of variation; allowance is the intentional difference between mating parts for a specific fit (clearance, transition, interference). Interchangeability: parts made to the same standard can replace each other without custom fitting. Jig holds and guides tools; fixture holds workpieces; both improve consistency. Recall: ‘Jig guides, fixture fixes.’
英国标准（BS） 和 ISO 为产品和过程设定要求，以确保安全性和互操作性。公差 是允许的变动范围；偏差 是为获得特定配合（间隙、过渡、过盈）而在配合零件之间有意设置的差异。互换性：按照相同标准制造的零件可以相互替换，无需定制调整。钻模 夹持并引导刀具；夹具 夹持工件；两者都能提高一致性。记住：’钻模引导，夹具固定。’
9. Sustainable Engineering & the Environment | 可持续工程与环境
Life cycle assessment (LCA) analyses environmental impacts from raw material extraction, manufacturing, use, and disposal. Renewable energy: solar, wind, hydro, tidal, geothermal, biomass. Non-renewable: fossil fuels (coal, oil, gas), nuclear. Recycling processes waste into new material. Upcycling adds value to waste, turning it into a higher-quality product. Circular economy aims to keep resources in use for as long as possible, extracting maximum value and then recovering and regenerating materials.
生命周期评估（LCA） 分析从原材料提取、制造、使用到处置的环境影响。可再生能源：太阳能、风能、水力、潮汐能、地热能、生物质能。不可再生能源：化石燃料（煤、石油、天然气）、核能。回收 将废物加工成新材料。升级再造 为废物增加价值，将其变成更高质量的产品。循环经济 旨在尽可能长时间地保持资源使用，提取最大价值，然后回收并再生材料。
Sustainability means meeting present needs without compromising future generations. Engineers must consider the 6Rs: Reduce, Reuse, Recycle, Repair, Refuse, Rethink. Carbon footprint: total greenhouse gas emissions caused directly and indirectly by a product or activity. Embodied energy is the total energy required to produce a material or product, including extraction and processing. Aluminium has high embodied energy.
可持续性 意味着满足当前需求而不损害后代的能力。工程师必须考虑 6R：减少、重复使用、回收、修理、拒绝、重新思考。碳足迹：一项产品或活动直接和间接造成的温室气体排放总量。嵌入能 是生产某种材料或产品所需的总能量，包括开采和加工。铝的嵌入能很高。
10. Smart & Modern Materials | 智能与现代材料
Smart materials sense and respond to changes in their environment without external control. Shape memory alloy (SMA), e.g., Nitinol, returns to a preset shape when heated. Piezoelectric material generates an electric charge when deformed, and vice versa; used in sensors, actuators, and buzzers. Thermochromic materials change colour with temperature; used in thermometers and novelty mugs. Photochromic materials darken when exposed to UV light (reactive lenses). Nanomaterials have structures at the nano-scale (1-100 nm); they can exhibit extraordinary strength or unique electrical properties.
智能材料 能在无外部控制的情况下感知并响应环境变化。形状记忆合金（SMA），例如镍钛诺，加热时返回预设形状。压电材料 在变形时产生电荷，反之亦然；用于传感器、执行器和蜂鸣器。热致变色 材料随温度改变颜色；用于温度计和新奇杯子。光致变色 材料在紫外线照射下变暗（变色镜片）。纳米材料 具有纳米级（1-100 纳米）的结构；它们可以表现出非凡的强度或独特的电学性质。
Composite materials combine two or more distinct materials to achieve properties better than either individual constituent. Fibreglass (GRP) uses glass fibres in a polymer matrix; strong and lightweight. Carbon fibre reinforced polymer (CFRP) is very stiff and strong for its weight, used in aerospace and sports equipment. Concrete is a composite of aggregate, cement, and water; reinforced concrete includes steel bars to take tension. Laminates (like plywood) have layers glued with alternating grain direction to improve strength and reduce warping.
复合材料 将两种或多种不同的材料结合起来，以获得比单一成分更好的性能。玻璃钢（GRP） 在聚合物基体中使用玻璃纤维；强度高且重量轻。碳纤维增强聚合物（CFRP） 相对于其重量来说非常硬且强，用于航空航天和运动器材。混凝土 是骨料、水泥和水的复合材料；钢筋混凝土包含钢筋以承受拉力。层压板（如胶合板）将层片粘合，木纹方向交替，以提高强度并减少翘曲。
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