📚 Year 13 WJEC Engineering: Vocabulary & Terminology Memorisation Guide | WJEC工程词汇术语速记指南
A robust engineering vocabulary is not just about passing exams – it’s about thinking clearly, communicating precisely, and solving problems efficiently. For Year 13 WJEC Engineering students, a vast array of specialised terms from mechanics, materials, electronics and manufacturing can feel daunting. This guide breaks down essential terminology into logical groups, pairs each concept with a memorable hook, and provides bilingual explanations to reinforce deep understanding. By linking symbols, units, real-world analogies and mnemonics, you can transform rote memorisation into lasting knowledge.
扎实的工程词汇量不仅是为了通过考试，更是为了清晰地思考、精准地沟通和高效地解决问题。对于 Year 13 WJEC 工程学生来说，来自力学、材料、电子和制造等领域的大量专业术语可能让人望而生畏。本指南将核心术语按逻辑分组，为每个概念配上易记的钩子，并提供双语解释以强化深层理解。通过将符号、单位、现实类比和助记符联系起来，你可以把死记硬背转化为持久的学科素养。
1. Stress, Strain and Elasticity | 应力、应变与弹性
Stress (σ) is the internal resistance of a material to an externally applied force, calculated as force F divided by cross-sectional area A (σ = F/A). Imagine sigma (σ) as a coil spring being compressed – its curves resemble the letter ‘S’ under pressure, and ‘S’ starts the word Stress. The unit, pascal (Pa), is N/m²; think of a single newton spread over a square metre – a very gentle pressure, which is why we often use MPa or GPa.
应力（σ）是材料抵抗外力作用的内力，由力 F 除以横截面积 A 得出（σ = F/A）。把西格玛（σ）想象成受压的螺旋弹簧——其曲线像受到挤压的字母 S，而 S 正是应力 Stress 的首字母。单位帕斯卡（Pa）即 N/m²；可以想象一牛顿的力铺展在一平方米上——压力极小，因此工程中常用 MPa 或 GPa。
Strain (ε) is the extension per unit original length, a dimensionless ratio (ε = ΔL/L₀). The symbol ε looks like an elongated ‘e’, which can remind you that strain is about elongation. Since it has no units, we often express it as a percentage. Direct strain is a change in length, while shear strain (γ) is an angular distortion; the gamma (γ) resembles a right angle being twisted.
应变（ε）是单位原长的伸长量，是一个无量纲比值（ε = ΔL/L₀）。符号 ε 看起来像一个拉长了的 e，可以提醒你这是关于伸长的量。由于没有单位，常用百分数表示。正应变是长度变化，而切应变（γ）是角度畸变；伽马 γ 的尖角形状就像直角被扭曲。
Young’s modulus (E) quantifies stiffness: E = σ/ε within the proportional limit. The letter E connects directly to Elasticity. On a stress-strain graph, the straight-line slope is E; think ‘E equals slope’ – if you draw a small ‘e’ over the linear portion, it sits like a tangent. Hooke’s law is the linear relationship F = kx; note that stiffness k is the gradient of the force-extension graph, whereas E is intrinsic to the material.
杨氏模量（E）定量描述刚度：在比例极限内，E = σ/ε。字母 E 直接和弹性 Elasticity 挂钩。在应力-应变图上，直线段的斜率就是 E；可以想象在线性段上方画一个小写的 e，它就像切线一样。胡克定律描述线性关系 F = kx；注意刚度 k 是力-伸长图的梯度，而 E 是材料本身固有属性。
2. Mechanical Properties and Testing | 机械性能与测试
Yield strength (σ_y) marks the transition from elastic to plastic behaviour. Visualise a metal bar bending slowly – at the yield point, it ‘gives way’ irreversibly. The symbol σ_y uses subscript ‘y’ for yielding. Proof stress (σ₀.₂) is used for materials without a clear yield point; it is the stress that produces 0.2% permanent strain. Think of the offset method: draw a line parallel to the elastic slope, starting at 0.2% strain on the x-axis; the intersection is the proof stress – ‘offset 0.2 percent’ as a memory phrase.
屈服强度（σ_y）标志着从弹性到塑性行为的转变。想象一根金属棒慢慢弯曲——在屈服点，它不可逆地“屈服”了。符号 σ_y 用下标 y 表示 yielding。对于没有明显屈服点的材料，使用规定非比例延伸强度（σ₀.₂），即产生 0.2% 永久应变的应力。想象偏移法：从 x 轴 0.2% 应变处画一条平行于弹性斜率的直线，交点即为规定非比例延伸强度——记住“偏移 0.2%”这个短语。
Ultimate tensile strength (UTS or σ_UTS) is the maximum stress on the engineering stress-strain curve. It’s the peak of the curve before necking; ‘ultimate’ means the highest point before failure begins. Necking is a localised reduction in cross-sectional area – imagine a plastic ruler being pulled until a white ‘neck’ forms and thins out.
抗拉强度（UTS 或 σ_UTS）是工程应力-应变曲线上的最大应力。它是颈缩前曲线的峰值；’ultimate’ 指破坏开始前的最高点。颈缩是横截面积的局部缩减——想象一把塑料尺子被拉长，直到出现泛白的“颈”并变细。
Ductility (often measured by percentage elongation) describes how much a material can be plastically deformed before fracture. ‘Ductile’ sounds like ‘duct tape’ – which can be stretched and shaped. Malleability refers to compression under hammering; ‘malleable’ shares roots with ‘mallet’ (a hammer). Toughness is the energy absorbed up to fracture (area under the stress-strain curve); a tough material withstands impact – think ‘tough as nails’. Hardness resists surface indentation; the Mohs or Brinell tests use indenters, associating ‘hard’ with ‘scratch’.
延展性（常用断后伸长率衡量）描述材料在断裂前能承受多少塑性变形。’Ductile’ 听起来像 ‘duct tape’（强力胶带）——可以被拉伸和塑形。可锻性指受锤击压缩的能力；’malleable’ 与 ‘mallet’（木槌）同源。韧性是断裂前吸收的能量（应力-应变曲线下的面积）；韧性材料能抵抗冲击——想象“像钉子一样坚韧”。硬度抵抗表面压痕；莫氏或布氏硬度使用压头，硬度和“划痕”联系起来。
3. Thermodynamics and Fluid Mechanics | 热力学与流体力学
The first law of thermodynamics is often written ΔU = Q – W, where ΔU is change in internal energy, Q is heat added to the system, and W is work done by the system. A memory trick: ‘U gain equals Q in minus W out’ – the system’s internal energy rises if you heat it but falls if it does work on the surroundings. The delta (Δ) always means ‘change in’.
热力学第一定律常写作 ΔU = Q – W，其中 ΔU 是内能变化，Q 是系统吸收的热量，W 是系统对外做的功。记忆窍门：“内能增量等于吸热减去对外做功”——如果加热系统，内能增加；如果系统对外做功，内能减少。Δ 永远代表“变化量”。
Enthalpy (H) is defined as H = U + PV. It is useful for constant-pressure processes. Remember ‘Enthalpy has a Plus P V’ – the ‘H’ might make you think of ‘Heat’ at constant pressure. Entropy (S) measures disorder; ‘S’ stands for ‘spread’ of energy or ‘shambles’. The second law states that the entropy of an isolated system tends to increase – ‘mess always grows’.
焓（H）定义为 H = U + PV，对恒压过程特别有用。记住“Enthalpy 有 Plus P V”——字母 H 可联想到恒压下的热（Heat）。熵（S）度量无序程度；S 代表能量的“扩散（spread）”或“乱成一团（shambles）”。热力学第二定律指出孤立系统的熵趋于增加——“混乱总是增长”。
In fluid mechanics, Bernoulli’s equation for steady, incompressible flow is p + ½ρv² + ρgh = constant. Think of it as energy per volume: pressure energy + kinetic energy + potential energy stays constant along a streamline. The ‘½ρv²’ term shows that higher velocity means lower pressure – imagine a fast-moving train pulling nearby air, reducing pressure.
在流体力学中，定常不可压缩流动的伯努利方程为 p + ½ρv² + ρgh = 常量。可将其视为单位体积的能量：压力能 + 动能 + 势能沿流线保持不变。项 ½ρv² 表明流速越高压力越低——想象高速列车带动周边空气，使压力降低。
Viscosity (dynamic viscosity η, kinematic viscosity ν) describes a fluid’s resistance to flow. ‘Visc’ sounds like ‘thick’ – honey has high viscosity. Reynold’s number (Re = ρvL/η) predicts flow regime; Re < 2300 is laminar (smooth layers, like sheets sliding), Re > 4000 is turbulent (chaotic mixing). Use ‘Re low, slow and smooth; Re high, eddies and sky’ to recall.
黏度（动力黏度 η，运动黏度 ν）描述流体流动阻力。’Visc’ 听起来像“thick（稠）”——蜂蜜黏度高。雷诺数（Re = ρvL/η）预测流态；Re < 2300 为层流（平滑分层），Re > 4000 为湍流（混乱混合）。用“Re 低，缓慢平滑；Re 高，涡旋翻飞”来记忆。
4. Electronics and Circuit Components | 电子学与电路元件
Ohm’s law (V = IR) is fundamental. Memorise the triangle: V at top, I and R at bottom. When covering the quantity you want, the remaining arrangement shows the formula. For instance, covering V leaves I × R. The unit for resistance, ohm (Ω), sounds like ‘Oh!-m’ – the Greek letter omega looks like a little headphones, used to listen to ‘Ohm’.
欧姆定律（V = IR）是基础。记住三角形：V 在上，I 和 R 在下。遮住你想求的量，剩下的排列就是公式。比如遮住 V，剩下 I×R。电阻单位欧姆（Ω）读起来像 ‘Oh!-m’——希腊字母 omega 像一副小耳机，用来听“Ohm”。
Kirchhoff’s current law (KCL) states that the sum of currents entering a node equals the sum leaving it – ‘what goes in must come out’. Kirchhoff’s voltage law (KVL) says the sum of emfs equals the sum of potential drops around any closed loop. Visualise walking a loop: every rise in potential (battery) adds, every drop across a resistor subtracts, and you return to zero.
基尔霍夫电流定律（KCL）指出流入节点的电流之和等于流出的电流之和——“有进必有出”。基尔霍夫电压定律（KVL）说闭合回路中电动势代数和等于电压降代数和。想象沿回路步行：每次电位升高（电池）相加，经过电阻的电压降相减，最后回到零点。
Resistance in series: R_total = R₁ + R₂ + … ; in parallel: 1/R_total = 1/R₁ + 1/R₂ + … . To recall the reciprocal: ‘parallel paths make total resistance smaller – the formula flips’. Capacitance (C = Q/V) stores charge; capacitor in DC acts like an open circuit after charging. Inductance (L) measures opposition to change in current; an inductor ‘lags’ current behind voltage – ‘L’ for lag.
电阻串联：R_total = R₁ + R₂ + …；并联：1/R_total = 1/R₁ + 1/R₂ + …。记住倒数关系：“并联路径使总电阻变小——公式翻转”。电容（C = Q/V）储存电荷；直流电路中电容充电后相当于开路。电感（L）衡量对电流变化的阻碍；电感使电流滞后电压——L 代表滞后（lag）。
Semiconductor terms: doping adds impurities to silicon to create n-type (extra electrons) or p-type (holes). A diode (p-n junction) allows current in one direction; remember the arrow in its symbol points from p to n – conventional current flows with the arrow. An n-p-n transistor has two n-type layers separated by a thin p-type base; a small base current controls a larger collector current – ‘n-p-n, not pointing in (referring to the arrow on the emitter)’.
半导体术语：掺杂是向硅添加杂质以形成 n 型（多余电子）或 p 型（空穴）。二极管（pn 结）允许单向电流；记住符号中箭头从 p 指向 n——常规电流顺着箭头方向流过。npn 晶体管由两个 n 型层夹着薄 p 型基区组成；小微小的基极电流控制较大的集电极电流——“npn, arrow Not Pointing iN”。
5. Manufacturing Processes and Quality | 制造工艺与质量控制
Subtractive manufacturing removes material, such as turning, milling, drilling. Think of a sculptor chipping away. Additive manufacturing (3D printing) builds up layers; ‘add’ directly tells you it adds material. Forming processes like forging, rolling and extrusion change shape without removing material; ‘forming’ sounds like ‘shape forming’ – imagine pressing dough.
减材制造是去除材料，如车削、铣削、钻孔。想象雕塑家凿去多余部分。增材制造（3D 打印）逐层堆积；“增”直接表明是添加材料。成形工艺如锻造、轧制、挤压，在不去除材料的情况下改变形状；’forming’ 意为成形，想象压面团。
Casting pours molten metal into a mould. Terms: pattern (replica of the part), sprue (channel for metal entry), riser (reservoir to feed shrinkage). Remember ‘SPRuE’ starts the flow, ‘RISer’ rises to supply. Permanent moulds can be reused; sand casting uses expendable moulds – sand is cheap and disposable.
铸造是将熔融金属浇入模具。术语：模样（零件的复制品），直浇道（金属进入的通道），冒口（补缩储存器）。记住“SPRuE”开启流动，“RISer”上升补缩。永久模具可重复使用；砂型铸造使用一次性模具——沙子便宜且可弃。
Tolerances specify allowable dimensional variation; clearance, transition and interference fits describe shaft-hole relationships. Remember fit types: ‘Clearance has a gap (clear space), interference needs force (interferes with movement), transition can go either way.’ Surface roughness (Ra) is the arithmetic average of surface deviations; ‘Ra’ hints at ‘Roughness average’.
公差规定了允许的尺寸变动；间隙配合、过渡配合和过盈配合描述轴与孔的关系。记住配合类型：“间隙配合有缝隙（clear space），过盈需用力（interferes），过渡介于两者之间。” 表面粗糙度（Ra）是表面偏差的算术平均值；Ra 暗示了“粗糙度平均值”。
Quality control (QC) inspects products after production; quality assurance (QA) focuses on processes to prevent defects. ‘QC catches, QA prevents’ – QC is like a policeman catching mistakes, QA is designing the road rules. Statistical process control (SPC) uses control charts to monitor variation. The terms ‘upper/lower control limits’ (UCL/LCL) are crucial; a point outside limits signals an ‘out-of-control’ condition – imagine a heart monitor beeping when a beat exceeds limits.
质量控制（QC）在生产后检验产品；质量保证（QA）专注于预防缺陷的过程。’QC 抓缺陷，QA 防缺陷’——QC 像警察抓错，QA 则是设计交通规则。统计过程控制（SPC）使用控制图监控变异。上控制限（UCL）和下控制限（LCL）是关键；数据点超出界限表示“失控”——想象心电监护仪，心率超出界限就报警。
6. Materials Selection and Phase Diagrams | 材料选择与相图
Ferrous metals contain iron; their phase diagram is the iron-carbon diagram. Key points: eutectic (liquid transforms to two solids) and eutectoid (solid transforms to two solids). ‘Eutectic’ sounds like ‘eu-reka, solid mix from liquid’, while ‘eutectoid’ is ‘like eutectic but all solid start’. Pearlite is a lamellar mixture of ferrite and cementite; its alternating layers resemble mother-of-pearl’s iridescence.
黑色金属含铁；其相图是铁碳相图。关键点：共晶（液相转变为两种固相）和共析（固相转变为两种固相）。’Eutectic’ 发音像“尤里卡，液体变出固体混合物”，而 ‘eutectoid’ 是“像共晶但起始全是固体”。珠光体是铁素体和渗碳体的层片状混合物；其交替层与珍珠母贝的光泽相似。
Ferrite (α-iron) is soft and ductile BCC structure at low temperatures; austenite (γ-iron) is FCC, stable at high temperatures. Remember: ‘Ferrite is Fairly soft (BCC), Austenite at high temperatures (FCC) – think A for Austenite and high temperature’. Martensite forms by rapid quenching, producing a very hard BCT structure; ‘Martensite’ sounds like ‘martial art’ – tough and hardened.
铁素体（α 铁）是低温下体心立方（BCC）的软韧相；奥氏体（γ 铁）是面心立方（FCC），高温下稳定。记住：“铁素体 Ferrite 相当软（BCC），奥氏体 Austenite 在高温存在（FCC），A 对应 Austenite 和高温”。马氏体由快速淬火形成极硬的体心四方（BCT）结构；’Martensite’ 听起来像 ‘martial art’（武术）——强韧硬化。
Polymers are classified as thermoplastics (can be reheated and reshaped) and thermosets (permanently set upon heating). ‘Thermo-plastic’ means plastic when hot; thermosetting ‘sets’ into a cross-linked network. Composite materials combine a matrix and reinforcement, e.g., carbon-fibre reinforced polymer (CFRP). Memory: ‘Matrix is the glue, fibres carry the load.’
聚合物分为热塑性（可反复加热重塑）和热固性（加热后永久固化）。’Thermo-plastic’ 意为加热可塑；热固性表示“定型”成交联网络。复合材料由基体和增强体组合，例如碳纤维增强聚合物（CFRP）。记忆：“基体是胶水，纤维承受载荷。”
Material indices are derived from performance equations to select materials for minimum weight, maximum stiffness, etc. For a light, stiff beam, the index might be E^(1/2)/ρ or E^(1/3)/ρ depending on shape. ‘E over density root’ is a mnemonic: higher E, lower density gives a higher index – pick material with best figure of merit.
材料指数由性能方程推导，用于选择达到最小重量、最大刚度等目标的材料。对于轻质刚性梁，指数可能是 E^(1/2)/ρ 或 E^(1/3)/ρ，取决于形状。“杨氏模量除以密度开某次方”是记忆点：E 越高、密度越低，指数越高——选择优值最高的材料。
7. Design, CAD/CAM and Project Management | 设计、CAD/CAM与项目管理
CAD (Computer-Aided Design) is the creation of digital 2D or 3D models. CAM (Computer-Aided Manufacturing) uses computers to control machine tools. Remember: ‘CAD designs, CAM makes.’ CAE (Computer-Aided Engineering) analyses designs via FEA (Finite Element Analysis) or CFD (Computational Fluid Dynamics). Finite element breaks a structure into small elements to approximate stresses – think ‘finite piece puzzle’.
CAD（计算机辅助设计）创建数字二维或三维模型。CAM（计算机辅助制造）使用计算机控制机床。记住：“CAD 设计，CAM 制造。” CAE（计算机辅助工程）通过 FEA（有限元分析）或 CFD（计算流体动力学）分析设计。有限元将结构分解为小单元以逼近应力——想象“有限块拼图”。
Gantt charts display project tasks against time; each bar shows start, duration and finish. ‘Gantt is a bar graphant’ (not a real word but helps remember). Critical path method (CPM) identifies the longest sequence of dependent tasks – the project’s minimum duration. Any delay on the critical path delays the whole project; ‘critical’ meaning ‘crucial, no slack’. PERT (Program Evaluation Review Technique) uses optimistic, pessimistic and most likely time estimates.
甘特图显示项目任务随时间分布的条形图；每个条形表示开始、持续和结束。“甘特图是条形图。” 关键路径法（CPM）确定依赖任务的最长序列——项目最短工期。关键路径任何延误都会拖累整个项目；’critical’ 意为“关键，无浮动时间”。PERT（计划评审技术）使用乐观、悲观和最可能时间估算。
Design process steps: brief → research → specification → concept designs → development → prototype → testing → manufacture. A mnemonic: ‘Big Red Spiders Crawl Down Pipes To Matriculation’ or adapt your own. Risk assessment identifies hazards, evaluates likelihood and severity, and implements control measures. Remember ‘Hazard × Probability = Risk’.
设计流程：设计概要 → 调研 → 规格说明 → 概念设计 → 开发 → 原型 → 测试 → 制造。助记：“大蜘蛛沿管道爬向大学”（自创即可）。风险评估识别危害、评估发生概率和严重程度，并实施控制措施。记住“危害 × 概率 = 风险”。
8. Mathematical and Unit Prefixes | 数学与单位前缀速记
Engineering calculations involve many SI prefixes. Giga (G) = 10⁹, mega (M) = 10⁶, kilo (k) = 10³, milli (m) = 10⁻³, micro (µ) = 10⁻⁶, nano (n) = 10⁻⁹, pico (p) = 10⁻¹². The common mnemonic ‘Great Mighty King Henry Died By Drinking Chunky Milk Monday Night’ is for descending steps, but for engineers, linking ‘Gigantic Mega Kick’ to large ones, and ‘Milli Micro Nano Pico’ to miniature can work. Notice the Greek mu (µ) for micro – looks like a tiny ‘u’.
工程计算涉及许多 SI 前缀。吉 G = 10⁹，兆 M = 10⁶，千 k = 10³，毫 m = 10⁻³，微 µ = 10⁻⁶，纳 n = 10⁻⁹，皮 p = 10⁻¹²。常见的助记句子“Great Mighty King Henry…”可以调整。对于工程师，把“Gigantic Mega Kick”相联系，而“Milli Micro Nano Pico”从小到更小。注意微用的希腊字母 µ，像一个小写的 u。
Trigonometry: sine (sin), cosine (cos), tangent (tan). SOH CAH TOA is essential: Sin = Opposite/Hypotenuse, Cos = Adjacent/Hypotenuse, Tan = Opposite/Adjacent. In radians, 2π rad = 360°. Angles to radians: multiply by π/180. Scalar quantities have magnitude only (e.g., mass, speed, temperature). Vector quantities have magnitude and direction (e.g., force, velocity, displacement) – ‘Vector has an arrow to show direction’.
三角学：正弦 sin，余弦 cos，正切 tan。SOH CAH TOA 是必备口诀。角度制与弧度制：2π rad = 360°，角度换算弧度乘以 π/180。标量只有大小（质量、速率、温度），矢量有大小和方向（力、速度、位移）——矢量带箭头表示方向。
Calculus in physics: velocity v is dx/dt (derivative of displacement with respect to time). Acceleration a is dv/dt or d²x/dt². The integral of v gives displacement. Think of derivative as slope (steepness) and integral as area under graph. For work done by a spring, W = ½k x², not just kx, because the force varies linearly; remember ‘half for triangle area’.
物理中的微积分：速度 v 是 dx/dt（位移对时间的导数）。加速度 a 是 dv/dt 或 d²x/dt²。速度的积分得出位移。导数可看作斜率（陡峭程度），积分是曲线下的面积。弹簧做功 W = ½k x² 而非 kx，因为力是线性变化的；记住“一半是因为三角形面积”。
9. Common Engineering Abbreviations | 常见工程缩写
FBD: Free Body Diagram – a sketch isolating a body showing all forces and moments. ‘Free’ means all constraints replaced by forces. FEA: Finite Element Analysis. CFD: Computational Fluid Dynamics. CAD/CAM: Computer-Aided Design/Manufacturing. CNC: Computer Numerical Control – a machine controlled by coded instructions, usually G-code. ‘Numerical’ refers to coordinates.
FBD：自由体受力图——隔离物体，显示所有力和力矩的简图。’Free’ 意味着所有约束都被力取代。FEA：有限元分析。CFD：计算流体动力学。CAD/CAM：计算机辅助设计/制造。CNC：计算机数控——由编码指令（通常为 G 代码）控制的机器。“数值”指坐标。
UTS: Ultimate Tensile Strength. YS: Yield Strength. E: Young’s modulus. K: thermal conductivity or stiffness depending on context. HV, HRC, HB: Vickers, Rockwell C, Brinell hardness scales. ‘HV’ uses a diamond pyramid – ‘V’ for Vickers and diamond point shape. NDT: Non-Destructive Testing (ultrasonic, magnetic particle, dye penetrant). ‘NDT’ means ‘no damage’.
UTS：抗拉强度。YS：屈服强度。E：杨氏模量。K：导热系数或刚度，视上下文而定。HV、HRC、HB：维氏、洛氏 C、布氏硬度标尺。HV 使用金刚石正四棱锥压头——V 对应维氏和压头形状。NDT：无损检测（超声、磁粉、渗透）；’NDT’ 即“无破坏”。
PPE: Personal Protective Equipment. COSHH: Control of Substances Hazardous to Health. RIDDOR: Reporting of Injuries, Diseases and Dangerous Occurrences Regulations. ‘Riddor’ sounds like ‘Riddler’ reporting incidents. LEV: Local Exhaust Ventilation. MEMS: Micro-Electro-Mechanical Systems.
PPE：个人防护装备。COSHH：有害物质控制。RIDDOR：伤害、疾病和危险事件报告条例。’Riddor’ 听起来像谜语人报告事故。LEV：局部排气通风。MEMS：微机电系统。
10. Mnemonics and Memory Techniques for Engineering Terms | 工程术语的助记与记忆技巧
Acronyms: Create a word from first letters, like ‘CRAP’ for types of fit? Actually, fits: Clearance, Transition, Interference. Try ‘CIT’ – ‘Clear-fit Is Tight’ for Interference? Better: ‘CIT’ – Clearance, Interference, Transition, but order not important. For forces on a beam: use ‘Soap’ for Shear force and bending moment? Not needed. Instead, remember ‘BM’ Bending Moment sign conventions – sagging moment is positive, like a smile. ‘Sagging is Smiling (positive), Hogging is frowning (negative).’
首字母缩写法：用首字母组成单词。对于配合类型：CIT——间隙配合、过渡配合、过盈配合，顺序无妨。梁的力：记住弯矩符号规定——下凹正弯矩如笑脸。“下凹（sagging）是微笑（正），上拱（hogging）是皱眉（负）。”
Visualisation: Picture Young’s modulus E as a steep staircase – steeper means stiffer. Imagine current flow like water through pipes, with resistor as a narrow section. Capacitor is a bucket collecting water (charge) until it fills; bucket has a certain capacity C. Inductor is a water wheel with inertia resisting sudden changes in flow.
视觉化：将杨氏模量 E 想象为陡峭的楼梯——越陡越刚。把电流想象成水管中的水流，电阻是一段狭窄的管道。电容是收集电荷的水桶，达到容量为止；水桶有一定的容量 C。电感像一个有惯性的水轮，抵抗流量的突变。
Chunking: Break complex terms into parts. ‘Thermoplastic’ = thermo + plastic (heat + moldable). ‘Ferromagnetism’ = ferro (iron) + magnetism. ‘Isentropic’ = iso (same) + entropic (entropy) – process with constant entropy. ‘Adiabatic’ means no heat exchange; ‘a-dia-batic’ – ‘dia’ like ‘through’, no heat going through. ‘Polycrystalline’ = many crystals.
组块法：把复杂术语拆解。’Thermoplastic’ = thermo（热）+ plastic（可塑）。’Ferromagnetism’ = ferro（铁）+ magnetism（磁性）。’Isentropic’ = iso（等）+ entropic（熵）——等熵过程。’Adiabatic’ 表示绝热；’a-dia-batic’ 可联想为“无热量穿过”。’Polycrystalline’ = 多晶。
Spaced repetition and flashcards: Write term on one side, symbol and definition on the other. Review daily, focusing on difficult items. Self-test by covering symbols and recalling units and typical values. For instance, Young’s modulus of steel ~207 GPa; aluminium ~70 GPa; copper ~110 GPa. These typical values often appear in multiple-choice questions.
间隔重复和闪卡：正面写术语，反面写符号和定义。每日复习，聚焦难点。自我测试时遮住符号，回忆单位和典型数值。例如钢的杨氏模量约为 207 GPa，铝约 70 GPa，铜约 110 GPa。这些典型值常在选择题中出现。
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