烈焰雪花
m center m 中心mach angle 马赫角mach cone 马赫锥mach number 马赫数mach wave 马赫波mach zehnder interferometer 马赫 曾德耳干涉仪mach's principle 马赫原理machine language 机骑言machine oriented language 面向机颇语言macleod gage 麦克劳计macro crystal 粗晶macrography 宏观照相术macroinstability 宏观不稳定性macromolecule 高分子macron 宏观粒子macroparticle 宏观粒子macrophysics 宏观物理学macroscopic brownian motion 宏观布朗运动macroscopic particle 宏观粒子macroscopic quantization 宏观量子化macroscopic system 宏观系统macrostate 宏观态macrostructure 宏观结构macrosystem 宏观系统magdeburg hemispheres 马德堡球magellanic clouds 麦哲伦星系magellanic galaxy 麦哲伦星系magic eye 光党指示管magic lantern 幻灯magic number 幻数magic t t 形波导支路magma 岩浆magneli structure 马格涅利结构magnesium 镁magnet 磁铁magnetic 磁的magnetic amplifier 磁放大器magnetic analyzer 磁分析器magnetic anisotropy 磁蛤异性magnetic anomaly 磁异常magnetic axis 磁轴magnetic balance 磁力天平magnetic birefringence 磁双折射magnetic breakdown 磁哗magnetic bubble 磁泡magnetic bubble storage 磁泡存储器magnetic character figure 磁特正magnetic charge 磁荷magnetic chart 磁图magnetic circuit 磁路magnetic conductance 磁导magnetic core storage 磁芯存储器magnetic current 磁流magnetic declination 磁偏角magnetic deflection 磁偏转magnetic deflection mass spectrometer 磁偏转型质谱仪magnetic dip 磁倾角magnetic dipole 磁偶极子magnetic dipole moment 磁偶极矩magnetic dipole radiation 磁偶极辐射magnetic disk 磁盘magnetic disturbances 磁扰magnetic domain 磁畴magnetic domain walls 磁畴壁magnetic drum 磁鼓magnetic elements 磁元magnetic energy 磁能magnetic entropy 磁熵magnetic equator 磁赤道magnetic field 磁场magnetic field energy 磁场能量magnetic field intensity 磁场强度magnetic field strength 磁场强度magnetic fluid 磁铃magnetic flux 磁通量magnetic flux compression 磁通量紧缩magnetic flux density 磁通密度magnetic flux quantization 磁通量量子化magnetic fluxmeter 磁通量计magnetic focusing 磁致聚焦magnetic force 磁力magnetic head 磁头magnetic hysteresis 磁滞magnetic image 磁象magnetic inclination 磁倾角magnetic induction 磁感应magnetic induction flux 磁感应束magnetic kerr effect 克尔氏磁效应magnetic latitude 磁纬度magnetic leakage 磁漏magnetic lens 磁透镜magnetic line of force 磁力线magnetic loss 磁损耗magnetic map 磁图magnetic material 磁性材料magnetic memory 磁存储器magnetic mirror 磁镜magnetic moment 磁矩magnetic monopole 磁单极子magnetic needle 磁针magnetic north 磁北magnetic permeability 磁导率magnetic perturbation 磁扰magnetic point group 磁点群magnetic polarization 磁极化magnetic polaron 磁极化子magnetic pole 磁极magnetic potential 磁势magnetic pressure 磁压magnetic prism 磁棱镜magnetic probe 磁探针magnetic prospecting 磁法勘探magnetic quantum number 磁量子数magnetic recorder 磁记录器magnetic recording 磁记录magnetic refrigeration 磁冷却magnetic refrigerator 磁致冷机magnetic relaxation 磁弛豫magnetic reluctance 磁阻magnetic remanence 顽磁magnetic resistance 磁阻magnetic resonance 磁共振magnetic reynolds number 磁雷诺数magnetic rigidity 磁刚性magnetic rotatory dispersion 磁致旋光色散magnetic saturation 磁饱和magnetic semiconductor 磁性半导体magnetic separation 磁力选矿magnetic shell 磁壳magnetic shield 磁屏蔽magnetic sound recording 磁录音magnetic space group 磁空间群magnetic spectrometer 磁谱仪magnetic spin quantum number 自旋磁量子数magnetic star 磁星magnetic store 磁存储器magnetic storm 磁暴magnetic structure 磁结构magnetic substance 磁体magnetic superconductor 磁超导体magnetic surface 磁面magnetic susceptibility 磁化率magnetic tape 磁带magnetic thermometer 磁温度计magnetic thin film 磁薄膜magnetic torque 磁转矩magnetic transition 磁跃迁magnetic trap 磁阱magnetic variable 磁变星magnetic variable star 磁变星magnetic variations 磁变magnetic viscosity 磁粘滞性magnetics 磁学magnetism 磁magnetization 磁化magnetization curve 磁化曲线magnetization vector 磁化矢量magnetized black hole 磁化黑洞magnetizing 磁化magnetizing coil 磁化线圈magnetizing current 磁化电流magnetizing force 磁化力magneto aerodynamics 磁空气动力学magneto optic effect 磁光效应magneto oscillatory absorption 磁振荡吸收magneto rotation 磁致旋光magneto volume effect 磁体积效应magnetoacoustic effect 磁声效应magnetoacoustic wave 磁声波magnetocaloric effect 磁热效应magnetochemistry 磁化学magnetocircular dichroism 磁圆二向色性magnetodielectric 磁性电介质magnetodiode 磁敏二极管magnetoelastic effect 磁弹性效应magnetoelastic wave 磁弹性波magnetoelectricity 磁电学magnetogram 磁强记录图magnetograph 磁强记录仪magnetohydrodynamic instability 磁铃力学不稳定性magnetohydrodynamic wave 磁铃波magnetohydrodynamics 磁铃动力学magnetology 磁学magnetomechanical factor 磁力学因数magnetomechanics 磁力学magnetometer 磁强计magnetomotive force 磁通势magneton 磁子magnetooptics 磁光学magnetophotophoresis 磁光致泳动magnetoplasma 磁等离子体magnetoplasmadynamics 磁等离子体动力学magnetoplumbite 氧化铅铁淦氧磁体magnetopolaron 磁极化子magnetoreflection 磁反射magnetoresistance 磁阻效应magnetoresistor 磁致电阻器magnetosphere 磁层magnetostatic field 静磁场magnetostatics 静磁学magnetostriction 磁致伸缩magnetostriction oscillator 磁致伸缩振荡器magnetostrictive effect 磁致伸缩效应magnetothermal effect 磁致热效应magnetothermoelectric effect 磁致热电效应magnetron 磁控管magnetron vacuum gage 磁控管真空计magnification 放大率magnifier 放大镜magnifying glass 放大镜magnitude 量magnitude of the eclipse 食分magnon 磁振子magnus effect 马格努斯效应main quantum number 挚子数main sequence 烛main sequence stars 烛星main storage 宙储器major planets 大行星majorana force 马约喇纳力majorana neutrino 马约喇纳中微子majorana particle 马约喇纳粒子majorana spinor 马约喇纳旋量majority carrier 多数载劣majoron 马约喇纳量子maksutov telescope 马克苏托夫望远镜malleability 展性malter effect 马尔特效应malus law 马吕斯定律man made satellite 人造卫星mandelstam representation 曼德尔斯坦表象mandrin 细探针manganese 锰manganin 锰镍铜合金manifold 廖manipulator 机械手manometer 压力表manoscope 气体密度计manoscopy 气体密度测定manostat 稳压器mantle 地幔mantle convection 地幔对流mantle rayleigh wave 地幔瑞利波manual 手册many body force 多体力many body problem 多体问题many body system 多体系many wave approximation 多波近似mare 海margin 余量margin of error 误差范围margin of safety 安全因子marginal rays 边缘光线marine physics 海洋物理学mariner project 马里纳计划marisat system 海洋卫星系统mark 标记markoff chain 马尔柯夫链markoff process 马尔柯夫过程marriage of cable and satellites 电缆和人造卫星的联接mars 火星martensite 马氏体maser 微波激射器脉塞mass 质量mass absorption coefficient 质量吸收系数mass analysis 质量分析mass analyzer 质谱仪mass defect 质量筐mass effect 聚集效应mass energy conversion formula 质能换算公式mass energy equivalence principle 质能相当性原理mass energy relation 质能关系mass filter 滤质器mass flowmeter 质量量计mass formula 质量公式mass luminosity relation 质量发光度关系mass number 质量数mass renormalization 质量重正化mass separator 质量分离器mass shell 质壳mass spectrograph 质谱仪mass spectrometer 质谱仪mass spectroscopy 质谱法mass spectrum 质谱mass stopping power 质量阻止本领mass transfer 质量传递mass unit 质量单位massey criterion 梅涡据master equation 纸程master gyroscope 自由陀螺仪matching 匹配material 物质material point 质点material wave 物质波materials science 材料科学materials testing reactor 材料试验反应堆mathematical crystallography 数学晶体学mathematical expectation 数学期望值mathematical pendulum 单摆mathematical physics 数学物理mathematical programming 数学规划mathieu functions 马提厄函数matrix mechanics 矩阵力学matrix representation 矩阵表示matter 物质matter dominated universe 物质为诸宙matter wave 德布罗意波matthias rule 马赛厄斯定则matthiessen rule 马苇定则maupertuis' principle 莫佩尔秋原理maximum deviation 最大偏差maximum load 最大负载maximum lyapunov index 最大李亚普诺夫指数maximum permissible concentration 最大容许浓度maximum permissible dose 最大容许剂量maximum postulated accident 最大假设事故maximum speed 最大速度maximum stress 最大应力maximum temperature 最高温度maximum thermometer 最高温度表maximum velocity 最大速度maxwell 麦克斯韦maxwell boltzmann distribution 麦克斯韦 玻耳兹曼分布maxwell boltzmann statistics 麦克斯韦 玻耳兹曼统计maxwell bridge 麦克斯韦电桥maxwell demon 麦克斯韦妖maxwell field 麦克斯韦场maxwell relations 麦克斯韦关系maxwell velocity distribution 麦克斯韦的速度分布maxwell's distribution law 麦克斯韦分布律maxwell's equations 麦克斯韦方程maxwellian distribution 麦克斯韦分布maxwellmeter 磁通计mb 微巴mean acceleration 平均加速度mean deviation 平均偏差mean ergodic theorem 平均脯历经定理mean error 平均误差mean free path 平均自由程mean life 平均寿命mean lifetime 平均寿命mean solar day 平太阳日mean solar time 平太阳时mean square error 均方误差mean sun 平太阳mean value 平均值mean velocity 平均速度mean velosity 平场速度measure 测度measurement 测量measurement error 测量误差measuring 测量measuring apparatus 测量仪器measuring eyepiece 目镜测微计measuring instrument 测试仪器度量仪表measuring method 测量法measuring technique 测量技术mechanical energy 力学能mechanical equivalent of heat 热功当量mechanical filter 机械滤波器mechanical monochromator 机械单色器mechanical motion 力学运动mechanical system 力学系mechanical vibrations 机械振动mechanical world view of nature 机械的自然观mechanics 力学mechanism 机构mechanocaloric effect 机械热效应mechanochemistry 机械化学mechanoelectric conversion 机电变换mechanostriction 机致伸缩mechnical equivalent of light 光功当量medical electronics 医疗电子学medical physics 医用物理学medium 介质medium energy electron diffraction 中能电子衍射medium energy electron scattering spectroscopy 中能电子散射能谱学mega 兆mega electron volt 兆电子伏megacycle 兆周megawatt 兆瓦megger 高阻表megohm 兆欧meissner effect 迈斯纳效应meldometer 熔点测定计melt growth 熔体生长melting 熔化melting heat 熔化热melting point 熔点melting temperature 熔解温度membrane 膜memory 存储;记忆memory capacity 存储容量memory cell 存储单元memory effect 记忆效应memory register 存储寄存器mendeleev's periodic law 门捷列夫周期律mendelevium 钔meniscus 弯月面meniscus lens 弯月透镜mensa 山案座mercury 水星;水银mercury arc lamp 水银灯mercury arc rectifier 汞弧整流mercury barometer 水银气压表mercury cell 汞电池mercury diffusion pump 汞扩散泵mercury i chloride structure 氯化汞i型结构mercury relay 水银继电器mercury telemetry 水星遥测术mercury thermometer 水银温度表mercury vacuum gage 水银真空计mercury vapor lamp 水银灯meridian 子午线meridian passage 中天meridian transit 中天meridional ray 子午光线mesa transistor 台面型晶体管mesoatom 介子原子mesodynamics 介子动力学mesomolecule 介子分子mesomorphic state 介晶态meson 介子meson factory 介子工厂meson theory 介子理论meson theory of nuclear forces 核力的介子理论mesonic atom 介子原子mesonic molecule 介子分子mesopic vision 黄昏黎糜觉mesoscopic effect 介观效应mesosphere 中间层messier catalog 梅味星云星团表metacenter 定倾中心metal 金属metal film resistor 金属薄膜电阻器metal foil 金属箔metal insulator semiconductor light emitting diod 金属绝缘膜半导体发光二极管metal insulator transition 金属绝缘体跃迁metal nonmetal transition 金属非金属跃迁metal organic compound 有机金属化合物metal oxide semiconductor structure mos 结构metal vapor laser 金属蒸汽激光器metallic 金属的metallic binding 金属键metallic bond 金属键metallic crystal 金属晶体metallic element 金属元素metallic glass 金属玻璃metallic lustre 金属光泽metallic microcluster 金属微簇metallic reflection 金属反射metallic thin film 金属薄膜metallic valence 金属原子价metallized paper capacitor 镀金属纸介电容器metallography 金相学metallomicroscope 金相显微镜metallurgy 冶金学metamagnetism 亚磁性metastability 亚稳定性metastable atom 亚稳原子metastable equilibrium 亚稳平衡metastable level 亚稳能级metastable molecule 亚稳分子metastable nucleus 亚稳核metastable phase 亚稳相metastable state 亚稳状态meteor 燎meteor astronomy 燎天文学meteor camera 燎照相机meteor shower 燎雨meteor stream 燎群meteoric dust 燎尘meteoric iron 陨铁meteoric stone 石陨星meteorite 陨星meteorite crater 陨星坑meteoritic iron 陨铁meteoritics 陨石学meteorological acoustics 气象声学meteorological optics 气象光学meteorological radar 气象雷达meteorological satellite 气象卫星meteorological thermodynamics 气象热力学meteorology 气象学meter 米molectronics 分子电子学molecular absorption coefficient 分子吸收系数molecular acoustics 分子声学molecular astronomy 分子天文学molecular beam 分子束molecular beam epitaxy 分子束外延molecular beam magnetic resonance 分子束磁共振molecular beam maser 分子束微波激射器molecular beam scattering 分子束散射molecular beam spectroscopy 分子束光谱学molecular biology 分子生物学molecular bond 分子键molecular chaos 分子混沌态molecular clock 分子钟molecular cloud 分子云molecular compound 分子化合物molecular conductivity 分子导电率molecular crystal 分子晶体molecular diffusion 分子扩散molecular dynamics 分子动力学molecular electronics 分子电子学molecular field 分子场molecular field approximation 分子场近似molecular flow 分子流molecular force 分子力molecular force field 分子力场molecular gas laser 分子气体激光器molecular heat 分子热molecular image 分子图象molecular integral 分子积分molecular inversion 分子倒转molecular ion 分子离子molecular kinetic theory 分子运动论molecular lattice 分子晶格molecular magnet 分子磁铁molecular mass 分子质量molecular motion 分子运动molecular orbital 分子轨函数molecular physics 分子物理学molecular polarizability 分子极化度molecular polarization 分子极化molecular pump 分子泵molecular radius 分子半径molecular rays 分子束molecular reaction 分子反应molecular refraction 分子折射molecular rotation 分子转动molecular scattering 分子散射molecular science 分子科学molecular sieve 分子筛molecular spectrum 分子光谱molecular structure 分子结构molecular structure theory 分子结构论molecular viscosity 分子粘性molecular volume 克分子体积molecular weight 分子量molecule 分子moletron 分子加速器molybdenum 钼moment 矩moment of inertia 转动惯量moment of momentum 角动量momentum 动量本文来自: 恒星英语学习网(www.Hxen.com) 详细出处参考:
八点了解
柴油机Diesel Engine机舱Engine room Engine room casing主机Main engine付机Auxiliary engine机座 机架 贯穿螺栓 转车机Bedplate Engine frame Tie rod Turning gear自由端 飞轮端 机件 运动部件 部件、零件Free end Fly wheel end Machinery components Moving parts Parts附件紧固件Fittings, mountingsFixture气缸: CylinderA 列缸组第X 组:A bank No.3 cylinder unit气缸体Cylinder block气缸盖Cylinder cover缸套冷却腔Cylinder jacket缸套(衬) Cylinder liner气缸壁Cylinder wall活塞: Piston活塞顶Piston crown活塞头Piston head活塞杆Piston rod活塞杆填料函Piston rod stuffing box活塞环Piston ring活塞环槽Piston ring groove活塞销Piston pin, gudgeon pin活塞销轴承Piston pin bush活塞裙边Piston skirt耐磨环Wear ring33活塞阀Piston valve活塞泵二冲程; 四冲程上死点; 下死点Piston pumpTwo-stroke; four-strokeTop dead centre; bottom dead centre曲轴: Cranksha ft曲轴轴承曲轴联轴器法兰Cranksha ft bearingCranksha ft coupling fla nge曲柄箱曲柄箱防爆门CrankcaseCrankcase explosion relief valve曲柄、曲拐Crank曲柄销曲柄臂曲轴箱门观察孔CrankpinCrankwebCrankcase doorSight hole曲轴箱安全阀曲轴箱泄油管油雾探测器Relief valve of crankcaseOil drain pipe of crankcaseOil mist detector曲柄弯程Crank throw连杆Connecting rod连杆大端轴承Bearing at bottom end of connecting rod;Bottom end bearing连杆小端轴承Bearing at top end of connecting rod;十字头十字头销十字头轴承主轴承主轴颈Top end bearingCrossheadCrosshead pinCrosshead bearingMain bearingMain journal凸轮轴Camsha ft驱动凸轮轴的钢质大齿轮示功阀Steel gear wheel for camsha ft driveIndicator valve气缸安全阀Safety valve进气阀Inlet valve排气阀Exhaust valve摇臂Rocker arm导板Guide滑板Slide guide滑块Slid ing block顶杆Push rod燃油供给系统:Fuel(oil)supplysystem:燃油增压泵Fuel oil boost pump主供给泵Main supply pump备用泵Standby pump34燃油过滤器Fuel oil filter重油沉淀柜Heavy fuel oil settling tank重油日用柜Heavy fuel oil service tank柴油柜Diesel oil tank分离机Centrifuge加热器Heater粘度调节器Viscosity regulator压力调节阀Pressure regulating valve三通阀Three-way valve平衡阀Balance valve输送泵Transfer pump燃油喷射系统:Fuel(oil)injectionsystem:高压油泵(油头阀) Fuel oil injection pump, injection fuel valve,High pressure oil pump喷射泵Injection pump燃油喷射器(油头) Fuel injector喷嘴Nozzle止回阀Non-return valve针阀Needle valve正时调节阀Timing valve溢流阀Spill valve节流阀Throttle valve柱塞Plunger小(副)齿轮装置Pinion arrangement中间轴Intermed iate spind le弹簧Spring压紧螺母Compression nut凸轮Cam凸轮轴齿条:齿条复板齿条挡板Camsha ftRackRack chordShield of rack增压器:涡轮增压器废气涡轮增压器增压器蜗壳SuperchargerTurbochargerExhaust gas turbochargerspiral casing of the supercharger透平叶轮Turbine impeller(透平增压器)废气出口接头Exhaust connection涡轮端Turbine end空压机端Air compressor end应急鼓风机Emergency blower蒸汽轮机Steam turbine鼓风机: Blower35涡轮鼓风机Turbo-blower扫气: Scavenging横流扫气cross-flow scavenging回流扫气loop scavenging直流扫气uniflow scavenging扫气口Scavenge port扫气道Scavenge trunk扫气防爆装置Scavenge relief device进气口Inlet port排气口Exhaust port润滑系统:Lubricating(oil)system:储油槽Oil sump泄油柜Drain tank滤器Filter, strainer冷却器Cooler液位指示器Level gauge贮存柜Storage tank冷却系统:Coolingsystem:主机淡水冷却泵M.E. fresh water cooling pump备用淡水冷却泵Reverse fresh water cooling pump主机海水冷却泵M.E. sea water cooling pump备用海水冷却泵Reverse sea water cooling pump缸套冷却水泵Jacket cooling pump活塞冷却水(油)系统Piston cooling system (oil/water)油头冷却泵Fuel valve cooling pump付机淡水冷却泵Aux. E. fresh water cooling pump付机海水冷却泵Aux. E. sea water cooling pump热交换器:Heatexchanger:主机淡水冷却器M.E. fresh water cooler活塞水冷却器Piston water cooler主机油头冷却器M.E. fuel valve cooler缸套水冷却器jacket water cooler付机淡水冷却器Aux. E. fresh water cooler海水循环冷却器Sea water circulated cooler压缩空气系统:Compressedairsystem:空气压缩机Air compressor空气瓶Air receiver易熔塞Fusible plug高压空气管High-pressure air pipe36空气起动阀Air starting valve隔离止回阀Isola ting non-return valve释放阀Relief valve空气分配器Air distributor阻火器Flame trap爆炸(保险)膜片Bursting disc(k)操纵装置Control device安全装置Safety device调速器: Governor机械调速器Mecha nical governor电动调速器Electric governor速度传感装置Speed sensing arrangement液压机构Hydraulic unit惯性配重装置Flyweight assembly齿轮Gear wheel速度选择器Speed selector油雾探测器Oil mist detector联轴节: Coupling:弹性Elastic coupling挠性Flexible coupling机械Mecha nical coupling电动Electrica l coupling液力Hydraulic coupling液压Fluid coupling气动Pneumatic coupling电磁Electroma gnetic coupling离合器: Clutch操纵手柄手柄定位插销支架驱动机构Control handleSet pinSupportDriving unit传动机构Driven unit驱动叶轮Driving impeller传动叶轮Driven runner传动装置Gearing arrangement大齿轮Gearwheel小齿轮Pinion齿轮箱Gearbox倒车齿轮Reversing gear倒车齿轮箱Reversing gearbox转动叶片Rotating vane轴、轴承及螺旋浆Shaft,BearingandPropeller37轴系轴ShaftingShaft(指机械传动轴)推力轴Thrust shaft推力环Thrust collar推力块Thrust block中间轴Intermed iate shaft螺旋浆轴Propeller/screw shaft尾轴Tail shaft尾管轴Tube shaft实心轴Solid shaft空心轴Hollow shaft曲轴Crank shaft曲轴臂Crank web甩档,曲轴臂挠曲Crankshaft deflection凸轮轴Camsha ft蜗杆轴Worm shaft链轮轴Sprocket shaft链轮箱Sprocket casing轴套Shaft liner轴衬Shaft (axis) bush固定法兰Fixed fla nge联轴节Shaft coupling弹性联轴节Flexible coupling液压联轴节(液压法兰) Fluid coupling液力偶合器Hydraulic coupling磨擦离合器Friction clutch电磁离合器Electric coupling法兰螺栓Flange bolt键槽: Keyway:汤匙形round-ended雪撬形sled runner普通键槽keyed无键keyless尾轴管Stern tube:铸钢与钢板焊接式cast steel and steel plate welded锻钢与钢板焊接式forged steel and steel plate welded尾轴承stern bearing:铁梨木lignum vitae合成橡胶synthetic rubber塑料plastic白合金(巴氏合金)white-meta l油封装置Oil gla nd38轴(相当于定位肖)下沉量Axis; spind leWear-down对中Alignment顶举系数Jack factor偏移Sag曲折Gap扭转振动Torsional vibration单节;双节Single node; Two node共振Resonance转速禁区范围Restricted speed range扭转振动许用应力Allowable vibration stress瞬时许用应力Allowable transient vibration stress轴承Bearing主轴承Main bearing中间轴轴承Intermed iate bearing推力轴承Thrust bearing曲轴轴承Crank (sha ft) bearing滚柱轴承Roller bearing滚珠轴承Ball bearing铁梨木轴承Lignum vitae bearing尾轴管轴承Stern tube bearing轴瓦bush轴承支架bearing support轴承承窝bearing socket轴承垫片bearing shim轴承壳bearing shell轴承座bearing seat (pedestal)轴承盖bearing cap (cover)轴承块bearing block轴承环bearing collar (ring)保持圈Retaining ring螺旋浆Propeller整体式螺旋浆Solid propeller组合式螺旋浆Built-up propeller可调节螺距螺旋浆Controllable pitch propeller全方位式螺旋浆Directiona l propeller39材料materia l:锰铁黄铜Manganese iron brass高铝高强度黄铜High aluminium high strength brass高锰铝青铜High ma nganese aluminium bronze铸铁Cast iron铸钢Cast steel塑料Plastic
优质英语培训问答知识库