📚 GCSE OCR Engineering: Rapid Terminology Memorisation Guide | GCSE OCR 工程：词汇术语速记指南
Welcome to this quick-reference terminology guide designed specifically for GCSE OCR Engineering students. The subject demands a strong command of technical vocabulary across materials, mechanics, electronics, manufacturing and design. This resource groups key terms by topic and provides paired English–Chinese explanations along with simple memory hooks, making it easier to learn, recall and apply the correct terminology in your exam.
欢迎使用本速记术语指南，专为 GCSE OCR 工程学生编写。该科目要求你熟练掌握材料、力学、电子、制造和设计等方面的技术词汇。本资源按主题归类关键术语，并提供中英双语解释和简单的记忆线索，帮助你更轻松地学习、回忆并在考试中准确运用术语。
1. Material Properties | 材料属性
Strength: The ability of a material to withstand an applied force without breaking or deforming. Think of a steel lifting cable — it must have high tensile strength.
强度：材料承受外力而不破裂或变形的能力。想象一根钢制吊索——它必须具备很高的抗拉强度。
Hardness: Resistance to indentation, scratching or wear. Diamond is one of the hardest natural materials. Hardness is often tested with Brinell or Rockwell methods.
硬度：抵抗压痕、划痕或磨损的能力。金刚石是最硬的天然材料之一。硬度通常用布氏或洛氏方法测试。
Toughness: The capacity to absorb energy and deform plastically before fracturing. Tough materials, like mild steel, can withstand sudden impacts without shattering.
韧性：在断裂前吸收能量并发生塑性变形的能力。韧性材料（如低碳钢）能承受突然冲击而不碎裂。
Elasticity: The property of returning to original shape after the load is removed, as long as the elastic limit is not exceeded. A rubber band is highly elastic.
弹性：只要未超过弹性极限，载荷移除后恢复原始形状的性质。橡皮筋具有很高的弹性。
Plasticity: Permanent deformation that remains after the load is removed. Clay exhibits plasticity — you can mould it into a shape and it stays.
塑性：载荷移除后残留的永久变形。黏土表现出塑性——你把它捏成形状，它就会保持住。
Ductility: The ability to be stretched into a thin wire without breaking. Copper is highly ductile, making it ideal for electrical wiring.
延展性：能被拉成细丝而不断裂的能力。铜具有很高的延展性，因此非常适合制作电线。
Malleability: The ability to be hammered or rolled into thin sheets. Gold is extremely malleable; one gram can be beaten into a sheet of about one square metre.
可锻性：能被锤打或轧制成薄片的能力。金具有极佳的可锻性；一克金可被打成约一平方米的金箔。
Memory trick – Ductile vs Malleable: Ductile → drawn into wire (both start with D); Malleable → hammered into sheet (think of a mallet hammer).
记忆技巧——延展性与可锻性：Ductile（延展的）→ drawn into wire（拉成丝），都以 D 开头；Malleable（可锻的）→ mallet（木槌），可联想用锤子敲成薄片。
2. Mechanics and Structures | 力学与结构
Load: A force applied to a structure or component. Loads can be static (constant) or dynamic (varying).
载荷：作用在结构或构件上的力。载荷可以是静态的（恒定）或动态的（变化）。
Stress (σ): The internal force per unit area within a material. Formula: σ = F / A, where F is force (N) and A is cross-sectional area (m²). Unit: Pascal (Pa) or N/m².
应力 (σ)：材料内部单位面积上的内力。公式：σ = F / A，F 为力 (N)，A 为横截面积 (m²)。单位：帕斯卡 (Pa) 或 N/m²。
Strain (ε): The extension per unit length — a measure of deformation. Formula: ε = ΔL / L₀ (change in length divided by original length). Strain has no units.
应变 (ε)：单位长度的伸长量——变形的量度。公式：ε = ΔL / L₀（长度变化量除以原始长度）。应变无量纲。
Young’s Modulus (E): A measure of stiffness. E = stress / strain within the elastic region. A high modulus means the material is stiff.
杨氏模量 (E)：刚度的量度。在弹性范围内，E = 应力 / 应变。模量高表示材料刚硬。
Tension, Compression, Shear: Tension pulls apart, compression pushes together, shear causes layers to slide past each other. Scissors produce shear.
拉伸、压缩、剪切：拉伸是将材料拉开，压缩是将材料压在一起，剪切是使内部各层相互滑移。剪刀产生剪切作用。
Torsion: Twisting caused by an applied torque. A screwdriver shaft experiences torsion when driving a screw.
扭转：由施加的扭矩引起的扭曲。螺丝刀杆在旋紧螺丝时承受扭转。
Moment: The turning effect of a force. Moment = Force × perpendicular distance from the pivot. Unit: N m.
力矩：力的转动效应。力矩 = 力 × 到支点的垂直距离。单位：N m。
Equilibrium: A state where all forces and moments are balanced. Sum of clockwise moments = sum of anticlockwise moments.
平衡：所有力和力矩都相互抵消的状态。顺时针力矩之和等于逆时针力矩之和。
3. Manufacturing Processes | 制造工艺
Casting: Pouring molten metal into a mould cavity so it solidifies into the desired shape. Sand casting is common for large parts.
铸造：将熔融金属浇入模具型腔，使其凝固成所需形状。砂型铸造常用于大型零件。
Injection Moulding: Thermoplastic granules are melted and injected under high pressure into a steel mould. Used for high-volume production of plastic items such as bottle caps.
注塑成型：将热塑性颗粒熔融，在高压下注入钢制模具。用于大批量生产塑料制品，如瓶盖。
Extrusion: Material is pushed through a shaped die to create long continuous profiles with a constant cross-section — like aluminium window frames or plastic pipes.
挤出成型：材料被推过特定形状的模具，形成具有恒定截面的连续长条型材——例如铝制窗框或塑料管。
Forging: Shaping metal by applying compressive forces, often while the metal is hot. It improves grain structure and strength. Spanners are often forged.
锻造：通过施加压缩力使金属成形，通常在金属炽热时进行。锻造能改善晶粒结构并提高强度。扳手常采用锻造工艺。
Welding: Joining two metal pieces by melting the edges and adding a filler material. MIG, TIG and spot welding are common in engineering.
焊接：通过熔化边缘并添加填充材料来连接两块金属。工程中常用 MIG 焊、TIG 焊和点焊。
Soldering and Brazing: Both use a filler metal with a lower melting point than the workpieces. Soldering happens below 450 °C (electronics); brazing above 450 °C (stronger joints).
软钎焊与硬钎焊：两者都使用熔点低于工件的填充金属。软钎焊温度在 450 °C 以下（用于电子线路）；硬钎焊在 450 °C 以上（可获得更牢固的接头）。
CNC Machining: Computer Numerical Control uses programmed sequences to cut, drill and mill material with high precision. Think: a robot cutter following a digital blueprint.
CNC 加工：计算机数控利用编程指令高精度地切削、钻孔和铣削材料。想象一下，一台机器手按照数字蓝图进行切割。
Additive Manufacturing (3D Printing): Building parts layer by layer from plastic filament, resin or metal powder. Contrasts with subtractive methods.
增材制造（3D 打印）：通过逐层堆积塑料丝、树脂或金属粉末来制造零件。与减材制造方法形成对比。
4. Electronics and Control Systems | 电子与控制系统
Voltage (V): Electrical potential difference that drives current around a circuit. Unit: volt (V). Think of it as electrical pressure.
电压 (V)：驱动电流在电路中流动的电位差。单位：伏特 (V)。可将其想象为电气的“压力”。
Current (I): The flow of electric charge. Unit: ampere (A). Measured in series.
电流 (I)：电荷的流动。单位：安培 (A)。测量时需串联接入电路。
Resistance (R): Opposition to current flow. Unit: ohm (Ω). A thin, long wire has higher resistance.
电阻 (R)：对电流流动的阻碍。单位：欧姆 (Ω)。细长的导线电阻更高。
Ohm’s Law: V = I × R. You can rearrange it to find any single unknown. Use the triangle method to recall: V at the top, I and R at the bottom.
欧姆定律：V = I × R。可变形以求解任意未知量。利用三角形记忆法：V 在上方，I 和 R 在下方。
Electrical Power: P = I × V, also written as P = I²R or P = V²/R. Unit: watt (W).
电功率：P = I × V，也可写作 P = I²R 或 P = V²/R。单位：瓦特 (W)。
Sensors: Input devices that detect changes in the environment. LDR (light-dependent resistor) senses light; thermistor senses temperature. Their resistance changes with the physical quantity.
传感器：检测环境变化的输入设备。光敏电阻 (LDR) 感应光线；热敏电阻感应温度。它们的电阻会随物理量变化而改变。
Actuators: Output devices that produce movement or action. Examples: motor (spins), solenoid (linear push/pull), buzzer (sound).
执行器：产生运动或动作的输出设备。例如：电机（旋转）、螺线管（直线推拉）、蜂鸣器（发声）。
Microcontroller: A programmable integrated circuit that reads inputs, processes data, and controls outputs. Often using flowcharts to plan the program logic.
微控制器：可编程集成电路，读取输入、处理数据并控制输出。常借助流程图规划程序逻辑。
Open-loop vs Closed-loop: Open-loop has no feedback (e.g. timer-operated toaster). Closed-loop uses feedback to adjust the output (e.g. thermostat in an iron).
开环与闭环：开环无反馈（例如定时烤面包机）。闭环利用反馈调整输出（例如熨斗中的恒温器）。
5. Mechanical Systems | 机械系统
Lever: A rigid bar that pivots around a fulcrum to amplify force or distance. Classes of levers differ by fulcrum, effort and load positions.
杠杆：围绕支点转动的刚性杆，用于放大力量或距离。杠杆类别根据支点、动力点和阻力点的位置区分。
Linkage: A system of rigid rods connected by joints to transmit motion and force. Reverse-motion linkage changes the direction of movement.
连杆机构：由铰链连接的刚性杆系统，用于传递运动和力。反向连杆机构可改变运动方向。
Gear Train: Meshing gears used to change speed, torque or direction. Driver and driven: a small gear driving a large gear increases torque but reduces speed.
齿轮系：相互啮合的齿轮用来改变转速、扭矩或方向。主动轮与从动轮：小齿轮驱动大齿轮，增扭减速。
Pulley System: Uses ropes and wheels to change the direction of a force and provide mechanical advantage. A block and tackle multiplies lifting force.
滑轮系统：利用绳索和轮子改变力的方向并获得机械效益。滑轮组可以成倍增加提升力。
Mechanical Advantage (MA): MA = Load / Effort. It tells you how much a mechanism multiplies the input force.
机械效益 (MA)：MA = 负载 / 动力。它表示机构将输入力放大了多少倍。
Velocity Ratio (VR): VR = distance moved by effort / distance moved by load. In an ideal system with no friction, VR is fixed by geometry.
速度比 (VR)：VR = 动力移动的距离 / 负载移动的距离。在无摩擦的理想系统中，VR 由几何结构决定。
Efficiency: Efficiency = (MA / VR) × 100%. Real machines always have efficiency less than 100% due to friction.
效率：效率 = (MA / VR) × 100%。由于摩擦，实际机器的效率总是小于 100%。
6. Design Process and Tools | 设计过程与工具
Design Brief: A clear statement outlining the problem, the client’s needs and the intended outcome. It sets the direction without specifying the solution.
设计任务书：清晰陈述问题、客户需求和预期成果的文件。它只定方向，不规定具体解决方案。
Specification: A detailed list of measurable criteria the final product must meet (e.g. weight, cost, size, materials). Used to evaluate success.
规格说明：列出最终产品必须满足的可测量标准（如重量、成本、尺寸、材料）的详细清单，用于评估是否成功。
CAD (Computer-Aided Design): Using software to create precise 2D or 3D models. Allows easy modification, simulation and generation of orthographic/isometric views.
CAD（计算机辅助设计）：使用软件创建精确的二维或三维模型。便于修改、模拟及生成正投影/等轴测视图。
CAM (Computer-Aided Manufacture): Using computers to control machine tools. Often linked with CAD to directly produce parts (CAD/CAM).
CAM（计算机辅助制造）：用计算机控制机床加工。常与 CAD 结合直接生产零件 (CAD/CAM)。
Orthographic Projection: A method of drawing a 3D object using 2D views — typically front, side and plan — aligned correctly. Used for manufacturing drawings.
正投影：用二维视图（通常为正视图、侧视图和俯视图）正确对齐地表达三维物体的绘图方法，用于工程图。
Isometric Drawing: A 3D pictorial representation where the three axes are equally inclined (120° apart). No perspective distortion, so measurements stay true.
等轴测图：一种三维图示方法，三条轴等角度倾斜（互成 120°）。没有透视变形，因此尺寸保持真实。
7. Testing and Evaluation | 测试与评估
Tensile Testing: Pulling a sample until it breaks to measure tensile strength, yield point and elongation. A universal testing machine is used.
拉伸测试：将试样拉至断裂以测量抗拉强度、屈服点和伸长率。使用万能试验机。
Hardness Testing: Indenting a material with a hard ball or diamond pyramid and measuring the impression. Brinell, Vickers and Rockwell are common scales.
硬度测试：用硬球或金刚石压头压入材料并测量压痕大小。常用的有布氏、维氏和洛氏标度。
Impact Test (e.g. Izod): A notched sample is struck by a pendulum; the energy absorbed in breaking indicates toughness.
冲击测试（如 Izod 摆锤冲击）：用摆锤打击带缺口试样，通过断裂吸收的能量判断韧性。
Fatigue Testing: Applying repeated cyclic loads to determine the endurance limit — the stress below which a material can withstand unlimited cycles without failure.
疲劳测试：施加重复循环载荷以确定疲劳极限——材料在此应力以下能承受无数次循环而不失效。
Destructive vs Non-destructive Testing (NDT): Destructive testing damages the sample (tensile, impact). NDT inspects without damage — e.g. ultrasonic, dye penetrant, visual.
破坏性与无损检测 (NDT)：破坏性检测会损坏试样（如拉伸、冲击）；NDT 则在不损坏的情况下检验，如超声波、着色渗透、目视检查。
Evaluation: Critically comparing test results against the specification to judge fitness for purpose. Always suggests improvements.
评估：用批判性思维将测试结果与规格说明进行比较，以判断产品是否适用。通常会提出改进建议。
8. Health and Safety | 健康与安全
PPE (Personal Protective Equipment): Equipment worn to minimise exposure to hazards. Examples: safety glasses, steel-toe boots, ear defenders, gloves.
PPE（个人防护装备）：为了减少危险暴露而穿戴的装备。例如：护目镜、钢头鞋、护耳器、手套。
Risk Assessment: A systematic process of identifying hazards, evaluating the risk, and deciding on control measures. Often recorded as a 5-step plan.
风险评估：识别危害、评价风险并确定控制措施的系统过程。通常记录为五步法。
Hazard: Anything that has the potential to cause harm (e.g. rotating blades, hot surfaces). A risk is the likelihood that harm will occur.
危害：任何有潜力造成伤害的事物（如旋转刀片、高温表面）。风险则是伤害发生的可能性。
COSHH (Control of Substances Hazardous to Health): Regulations requiring employers to control exposure to hazardous chemicals, fumes and dusts.
COSHH（有害物质控制法规）：要求雇主控制接触有害化学品、烟雾和粉尘的法规。
Machine Guarding: Fixed or interlocked guards that prevent access to dangerous moving parts. Interlocked guards stop the machine when opened.
机器防护罩：防止接近危险运动部件的固定式或互锁式防护罩。互锁式防护罩打开时机器即停止。
Safe Manual Handling: Lifting techniques that reduce back injury — bend your knees, keep the load close, avoid twisting.
安全人力搬运：减少腰部损伤的提举技巧——屈膝、贴近身体、避免扭转。
9. Quality and Standards | 质量与标准
Quality Control (QC): Checking products after manufacture to identify defects. Involves inspection, measurement and testing — a reactive approach.
质量控制 (QC)：在产品制造后检查以发现缺陷。涉及检验、测量和测试，属于被动的方法。
Quality Assurance (QA): A proactive system that builds quality into every stage of production, aiming to prevent defects rather than detect them. Includes staff training and process audits.
质量保证 (QA)：一种主动性的体系，将质量融入生产的每个环节，旨在预防缺陷而非检测缺陷。包括人员培训和过程审核。
Tolerance: The permissible limit of variation in a dimension. For example, a shaft diameter of 10 ± 0.1 mm allows a range of 9.9 mm to 10.1 mm.
公差：尺寸允许的变动范围。例如轴径 10 ± 0.1 mm，允许范围是 9.9 mm 至 10.1 mm。
Fit: The relationship between two mating parts. Clearance fit (shaft smaller than hole), interference fit (shaft larger — press fit), transition fit (in between).
配合：两个配合零件之间的关系。间隙配合（轴小于孔）、过盈配合（轴大于孔——压配合）、过渡配合（介于两者之间）。
Surface Finish / Roughness: The texture of a surface measured as average deviation from the ideal plane. Smoother finishes reduce friction but cost more to produce.
表面粗糙度：表面纹理的度量，通常以偏离理想平面的平均偏差表示。更光滑的表面可减少摩擦但加工成本更高。
Standards (BS, ISO): Published documents that set out agreed specifications, procedures and safety requirements so components fit together and are fit for purpose. BS 8888 covers technical product documentation.
标准（BS、ISO）：发布的规定规格、程序和安全要求的文件，以确保零部件可互换且适用。BS 8888 涉及技术产品文件规范。
10. Key Formulas and Relationships | 关键公式与
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