机械设计名词术语（1）

时间：2007-03-30 03:04:52

（单词翻译:单击）

阿基米德蜗杆 Archimedes worm
安全系数 safety factor; factor of safety
安全载荷 safe load
凹面、凹度 concavity
扳手 wrench¹
板簧 flat leaf spring
半圆键 woodruff key
变形 deformation²
摆杆 oscillating bar
摆动从动件 oscillating follower³
摆动从动件凸轮机构 cam with oscillating follower
摆动导杆机构 oscillating guide-bar mechanism⁴
摆线齿轮 cycloidal gear
摆线齿形 cycloidal tooth profile
摆线运动规律 cycloidal motion
摆线针轮 cycloidal-pin wheel
包角 angle of contact
保持架 cage
背对背安装 back-to-back arrangement
背锥 back cone⁵ ； normal cone
背锥角 back angle
背锥距 back cone distance
比例尺 scale
比热容 specific heat capacity
闭式链 closed kinematic chain
闭链机构 closed chain mechanism
臂部 arm
变频器 frequency converters
变频调速 frequency control of motor speed
变速 speed change
变速齿轮 change gear ; change wheel
变位齿轮 modified gear
变位系数 modification⁶ coefficient
标准齿轮 standard gear
标准直齿轮 standard spur gear
表面质量系数 superficial mass factor
表面传热系数 surface coefficient of heat transfer
表面粗糙度 surface roughness
并联式组合 combination in parallel
并联机构 parallel mechanism
并联组合机构 parallel combined mechanism
并行工程 concurrent⁷ engineering
并行设计 concurred⁸ design, CD
不平衡相位 phase angle of unbalance
不平衡 imbalance (or unbalance)
不平衡量 amount of unbalance
不完全齿轮机构 intermittent⁹ gearing
波发生器 wave generator¹⁰
波数 number of waves
补偿 compensation
参数化设计 parameterization design, PD
残余应力 residual¹¹ stress
操纵及控制装置 operation control device
槽轮 Geneva wheel
槽轮机构 Geneva mechanism ； Maltese cross
槽数 Geneva numerate¹²
槽凸轮 groove¹³ cam
侧隙 backlash
差动轮系 differential gear train
差动螺旋机构 differential screw mechanism
差速器 differential
常用机构 conventional mechanism; mechanism in common use
车床 lathe¹⁴
承载量系数 bearing capacity factor
承载能力 bearing capacity
成对安装 paired mounting
尺寸系列 dimension series
齿槽 tooth space
齿槽宽 spacewidth
齿侧间隙 backlash
齿顶高 addendum¹⁵
齿顶圆 addendum circle
齿根高 dedendum
齿根圆 dedendum circle
齿厚 tooth thickness
齿距 circular pitch
齿宽 face width
齿廓 tooth profile
齿廓曲线 tooth curve
齿轮 gear
齿轮变速箱 speed-changing gear boxes
齿轮齿条机构 pinion¹⁶ and rack
齿轮插刀 pinion cutter; pinion-shaped shaper cutter
齿轮滚刀 hob ,hobbing cutter
齿轮机构 gear
齿轮轮坯 blank
齿轮传动系 pinion unit
齿轮联轴器 gear coupling
齿条传动 rack gear
齿数 tooth number
齿数比 gear ratio
齿条 rack
齿条插刀 rack cutter; rack-shaped shaper cutter
齿形链、无声链 silent chain
齿形系数 form factor
齿式棘轮机构 tooth ratchet mechanism
插齿机 gear shaper
重合点 coincident points
重合度 contact ratio
冲床 punch
传动比 transmission ratio, speed ratio
传动装置 gearing; transmission gear
传动系统 driven system
传动角 transmission angle
传动轴 transmission shaft¹⁷
串联式组合 combination in series
串联式组合机构 series combined mechanism
串级调速 cascade¹⁸ speed control
创新 innovation ; creation
创新设计 creation design
垂直载荷、法向载荷 normal load
唇形橡胶密封 lip rubber seal
磁流体轴承 magnetic fluid bearing
从动带轮 driven pulley
从动件 driven link, follower
从动件平底宽度 width of flat-face
从动件停歇 follower dwell
从动件运动规律 follower motion
从动轮 driven gear
粗线 bold line
粗牙螺纹 coarse thread
大齿轮 gear wheel
打包机 packer
打滑 slipping
带传动 belt driving
带轮 belt pulley
带式制动器 band brake
单列轴承 single row bearing
单向推力轴承 single-direction thrust bearing
单万向联轴节 single universal joint¹⁹
单位矢量 unit vector
当量齿轮 equivalent spur gear; virtual gear
当量齿数 equivalent teeth number; virtual number of teeth
当量摩擦系数 equivalent coefficient of friction²⁰
当量载荷 equivalent load
刀具 cutter
导数 derivative²¹
倒角 chamfer
导热性 conduction of heat
导程 lead
导程角 lead angle
等加等减速运动规律 parabolic motion; constant acceleration²² and deceleration motion
等速运动规律 uniform motion; constant velocity²³ motion
等径凸轮 conjugate²⁴ yoke²⁵ radial cam
等宽凸轮 constant-breadth cam
等效构件 equivalent link
等效力 equivalent force
等效力矩 equivalent moment of force
等效量 equivalent
等效质量 equivalent mass
等效转动惯量 equivalent moment of inertia²⁶
等效动力学模型 dynamically equivalent model
底座 chassis²⁷
低副 lower pair
点划线 chain dotted line
（疲劳）点蚀 pitting
垫圈 gasket
垫片密封 gasket seal
碟形弹簧 belleville spring
顶隙 bottom clearance²⁸
定轴轮系 ordinary gear train; gear train with fixed²⁹ axes
动力学 dynamics³⁰
动密封 kinematical seal
动能 dynamic energy
动力粘度 dynamic viscosity³¹
动力润滑 dynamic lubrication
动平衡 dynamic balance
动平衡机 dynamic balancing machine
动态特性 dynamic characteristics
动态分析设计 dynamic analysis design
动压力 dynamic reaction
动载荷 dynamic load
端面 transverse plane
端面参数 transverse parameters³²
端面齿距 transverse circular pitch
端面齿廓 transverse tooth profile
端面重合度 transverse contact ratio
端面模数 transverse module³³
端面压力角 transverse pressure angle
锻造 forge
对称循环应力 symmetry circulating stress
对心滚子从动件 radial (or in-line ) roller follower
对心直动从动件 radial (or in-line ) translating follower
对心移动从动件 radial reciprocating³⁴ follower
对心曲柄滑块机构 in-line slider-crank (or crank-slider) mechanism
多列轴承 multi-row bearing
多楔带 poly V-belt
多项式运动规律 polynomial motion
多质量转子 rotor with several masses
惰轮 idle gear
额定寿命 rating life
额定载荷 load rating
II 级杆组 dyad
发生线 generating line
发生面 generating plane
法面 normal plane
法面参数 normal parameters
法面齿距 normal circular pitch
法面模数 normal module
法面压力角 normal pressure angle
法向齿距 normal pitch
法向齿廓 normal tooth profile
法向直廓蜗杆 straight sided normal worm
法向力 normal force
反馈式组合 feedback combining
反向运动学 inverse³⁵ ( or backward) kinematics
反转法 kinematic inversion³⁶
反正切 Arctan
范成法 generating cutting
仿形法 form cutting
方案设计、概念设计 concept design, CD
防振装置 shockproof device
飞轮 flywheel
飞轮矩 moment of flywheel
非标准齿轮 nonstandard gear
非接触式密封 non-contact seal
非周期性速度波动 aperiodic speed fluctuation³⁷
非圆齿轮 non-circular gear
粉末合金 powder metallurgy
分度线 reference line; standard pitch line
分度圆 reference circle; standard (cutting) pitch circle
分度圆柱导程角 lead angle at reference cylinder³⁸
分度圆柱螺旋角 helix angle at reference cylinder
分母 denominator
分子 numerator
分度圆锥 reference cone; standard pitch cone
分析法 analytical³⁹ method
封闭差动轮系 planetary differential
复合铰链 compound hinge
复合式组合 compound combining
复合轮系 compound (or combined) gear train
复合平带 compound flat belt
复合应力 combined stress
复式螺旋机构 Compound screw mechanism
复杂机构 complex mechanism
杆组 Assur group
干涉 interference
刚度系数 stiffness coefficient
刚轮 rigid⁴⁰ circular spline
钢丝软轴 wire soft shaft
刚体导引机构 body guidance mechanism
刚性冲击 rigid impulse (shock)
刚性转子 rigid rotor
刚性轴承 rigid bearing
刚性联轴器 rigid coupling
高度系列 height series
高速带 high speed belt
高副 higher pair
格拉晓夫定理 Grashoff`s law
根切 undercutting
公称直径 nominal⁴¹ diameter
高度系列 height series
功 work
工况系数 application factor
工艺设计 technological⁴² design
工作循环图 working cycle diagram
工作机构 operation mechanism
工作载荷 external loads
工作空间 working space
工作应力 working stress
工作阻力 effective resistance
工作阻力矩 effective resistance moment
公法线 common normal line
公共约束 general constraint⁴³
公制齿轮 metric gears
功率 power
功能分析设计 function analyses design
共轭齿廓 conjugate profiles
共轭凸轮 conjugate cam
构件 link
鼓风机 blower
固定构件 fixed link; frame
固体润滑剂 solid lubricant
关节型操作器 jointed⁴⁴ manipulator
惯性力 inertia force
惯性力矩 moment of inertia ,shaking moment
惯性力平衡 balance of shaking force
惯性力完全平衡 full balance of shaking force
惯性力部分平衡 partial balance of shaking force
惯性主矩 resultant moment of inertia
惯性主失 resultant vector of inertia
冠轮 crown gear
广义机构 generation mechanism
广义坐标 generalized coordinate⁴⁵
轨迹生成 path generation
轨迹发生器 path generator
滚刀 hob
滚道 raceway
滚动体 rolling element
滚动轴承 rolling bearing
滚动轴承代号 rolling bearing identification code
滚针 needle roller
滚针轴承 needle roller bearing
滚子 roller
滚子轴承 roller bearing
滚子半径 radius⁴⁶ of roller
滚子从动件 roller follower
滚子链 roller chain
滚子链联轴器 double roller chain coupling
滚珠丝杆 ball screw
滚柱式单向超越离合器 roller clutch
过度切割 undercutting
函数发生器 function generator
函数生成 function generation
含油轴承 oil bearing
耗油量 oil consumption
耗油量系数 oil consumption factor
赫兹公式 H. Hertz equation
合成弯矩 resultant bending moment
合力 resultant force
合力矩 resultant moment of force
黑箱 black box
横坐标 abscissa
互换性齿轮 interchangeable gears
花键 spline
滑键、导键 feather key
滑动轴承 sliding bearing
滑动率 sliding ratio
滑块 slider
环面蜗杆 toroid helicoids worm
环形弹簧 annular spring
缓冲装置 shocks; shock-absorber
灰铸铁 grey cast iron
回程 return
回转体平衡 balance of rotors
混合轮系 compound gear train
积分 integrate
机电一体化系统设计 mechanical-electrical integration system design
机构 mechanism
机构分析 analysis of mechanism
机构平衡 balance of mechanism
机构学 mechanism
机构运动设计 kinematic design of mechanism
机构运动简图 kinematic sketch of mechanism
机构综合 synthesis of mechanism
机构组成 constitution of mechanism
机架 frame, fixed link
机架变换 kinematic inversion
机器 machine
机器人 robot
机器人操作器 manipulator
机器人学 robotics
技术过程 technique process
技术经济评价 technical and economic evaluation
技术系统 technique system
机械 machinery
机械创新设计 mechanical creation design, MCD
机械系统设计 mechanical system design, MSD
机械动力分析 dynamic analysis of machinery
机械动力设计 dynamic design of machinery
机械动力学 dynamics of machinery
机械的现代设计 modern machine design
机械系统 mechanical system
机械利益 mechanical advantage
机械平衡 balance of machinery
机械手 manipulator
机械设计 machine design; mechanical design
机械特性 mechanical behavior
机械调速 mechanical speed governors
机械效率 mechanical efficiency
机械原理 theory of machines and mechanisms
机械运转不均匀系数 coefficient of speed fluctuation
机械无级变速 mechanical stepless speed changes
基础机构 fundamental mechanism
基本额定寿命 basic rating life
基于实例设计 case-based design,CBD
基圆 base circle
基圆半径 radius of base circle
基圆齿距 base pitch
基圆压力角 pressure angle of base circle
基圆柱 base cylinder
基圆锥 base cone
急回机构 quick-return mechanism
急回特性 quick-return characteristics
急回系数 advance-to return-time ratio
急回运动 quick-return motion
棘轮 ratchet
棘轮机构 ratchet mechanism
棘爪 pawl
极限位置 extreme (or limiting) position
极位夹角 crank angle between extreme (or limiting) positions
计算机辅助设计 computer aided design, CAD
计算机辅助制造 computer aided manufacturing, CAM
计算机集成制造系统 computer integrated manufacturing system, CIMS
计算力矩 factored moment; calculation moment
计算弯矩 calculated bending moment
加权系数 weighting efficient
加速度 acceleration
加速度分析 acceleration analysis
加速度曲线 acceleration diagram
尖点 pointing; cusp
尖底从动件 knife-edge follower
间隙 backlash
间歇运动机构 intermittent motion mechanism
减速比 reduction ratio
减速齿轮、减速装置 reduction gear
减速器 speed reducer
减摩性 anti-friction quality

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收听单词发音

1 wrench
v.猛拧；挣脱；使扭伤；n.扳手；痛苦，难受
参考例句：
He gave a wrench to his ankle when he jumped down.他跳下去的时候扭伤了足踝。 It was a wrench to leave the old home.离开这个老家非常痛苦。

2 deformation
n.形状损坏；变形；畸形
参考例句：
The deformation frequencies are not sufficiently distinctive.其变形频率不是十分明显的。 The calculated deformation is almost equal to the real situation by measurement.经检测，计算变形量与实际情况基本一致。

3 follower
n.跟随者；随员；门徒；信徒
参考例句：
He is a faithful follower of his home football team.他是他家乡足球队的忠实拥护者。 Alexander is a pious follower of the faith.亚历山大是个虔诚的信徒。

4 mechanism
n.机械装置；机构，结构
参考例句：
The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。 The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。

5 cone
n.圆锥体，圆锥形东西，球果
参考例句：
Saw-dust piled up in a great cone.锯屑堆积如山。 The police have sectioned off part of the road with traffic cone.警察用锥形路标把部分路面分隔开来。

6 modification
n.修改，改进，缓和，减轻
参考例句：
The law,in its present form,is unjust;it needs modification.现行的法律是不公正的，它需要修改。 The design requires considerable modification.这个设计需要作大的修改。

7 concurrent
adj.同时发生的，一致的
参考例句：
You can't attend two concurrent events!你不能同时参加两项活动！ The twins had concurrent birthday. 双胞胎生日在同一天。

8 concurred
同意（concur的过去式与过去分词形式）
参考例句：
Historians have concurred with each other in this view. 历史学家在这个观点上已取得一致意见。 So many things concurred to give rise to the problem. 许多事情同时发生而导致了这一问题。

9 intermittent
adj.间歇的，断断续续的
参考例句：
Did you hear the intermittent sound outside?你听见外面时断时续的声音了吗？ In the daytime intermittent rains freshened all the earth.白天里，时断时续地下着雨，使整个大地都生气勃勃了。

10 generator
n.发电机，发生器
参考例句：
All the while the giant generator poured out its power.巨大的发电机一刻不停地发出电力。 This is an alternating current generator.这是一台交流发电机。

11 residual
adj.复播复映追加时间；存留下来的，剩余的
参考例句：
There are still a few residual problems with the computer program.电脑程序还有一些残留问题。 The resulting residual chromatism is known as secondary spectrum.所得到的剩余色差叫做二次光谱。

12 numerate
adj. 数学基础好的；v.数，列举
参考例句：
Your children should be literate and numerate.你的孩子应该会识字算数。 Business graduates must also be numerate,because most degrees will have courses in quantitative methods and statistics.商科专业大学毕业生也必须具备良好的数学能力，因为大部分学位涉及定量研究法和统计学领域课程。

13 groove
n.沟，槽；凹线，（刻出的）线条，习惯
参考例句：
They're happy to stay in the same old groove.他们乐于墨守成规。 The cupboard door slides open along the groove.食橱门沿槽移开。

14 lathe
n.车床，陶器，镟床
参考例句：
Gradually she learned to operate a lathe.她慢慢地学会了开车床。 That lathe went out of order at times.那台车床有时发生故障。

15 addendum
n.补充，附录
参考例句：
This is an addendum to the book.这是本书的附录。 Six parts and one addendum are separated in the paper.论文由六章和一个附录组成。

16 pinion
v.束缚；n.小齿轮
参考例句：
At nine the next morning Bentley was pinioned,hooded and hanged.次日上午9点，本特里被捆住双臂，戴上头罩，然后绞死了。 Why don't you try tightening the pinion nut first?你为什么不先扭紧小齿轮的螺帽？

17 shaft
n.(工具的)柄，杆状物
参考例句：
He was wounded by a shaft.他被箭击中受伤。 This is the shaft of a steam engine.这是一个蒸汽机主轴。

18 cascade
n.小瀑布，喷流；层叠；vi.成瀑布落下
参考例句：
She watched the magnificent waterfall cascade down the mountainside.她看着壮观的瀑布从山坡上倾泻而下。 Her hair fell over her shoulders in a cascade of curls.她的卷发像瀑布一样垂在肩上。

19 joint
adj.联合的，共同的；n.关节，接合处；v.连接，贴合
参考例句：
I had a bad fall,which put my shoulder out of joint.我重重地摔了一跤，肩膀脫臼了。 We wrote a letter in joint names.我们联名写了封信。

20 friction
n.摩擦，摩擦力
参考例句：
When Joan returned to work,the friction between them increased.琼回来工作后，他们之间的摩擦加剧了。 Friction acts on moving bodies and brings them to a stop.摩擦力作用于运动着的物体，并使其停止。

21 derivative
n.派(衍)生物；adj.非独创性的，模仿他人的
参考例句：
His paintings are really quite derivative.他的画实在没有创意。 Derivative works are far more complicated.派生作品更加复杂。

22 acceleration
n.加速，加速度
参考例句：
All spacemen must be able to bear acceleration.所有太空人都应能承受加速度。 He has also called for an acceleration of political reforms.他同时呼吁加快政治改革的步伐。

23 velocity
n.速度，速率
参考例句：
Einstein's theory links energy with mass and velocity of light.爱因斯坦的理论把能量同质量和光速联系起来。 The velocity of light is about 300000 kilometres per second.光速约为每秒300000公里。

24 conjugate
vt.使成对，使结合；adj.共轭的，成对的
参考例句：
A partition that is its own conjugate is ealled self-conjugate.一个分析如与其自身共轭称为自共轭。 It is important to learn to conjugate irregular verbs.学会不规则动词的变化是相当重要的。

25 yoke
n.轭；支配；v.给...上轭，连接，使成配偶
参考例句：
An ass and an ox,fastened to the same yoke,were drawing a wagon.驴子和公牛一起套在轭上拉车。 The defeated army passed under the yoke.败军在轭门下通过。

26 inertia
adj.惰性，惯性，懒惰，迟钝
参考例句：
We had a feeling of inertia in the afternoon.下午我们感觉很懒。 Inertia carried the plane onto the ground.飞机靠惯性着陆。

27 chassis
n.汽车等之底盘；（飞机的）起落架；炮底架
参考例句：
The new parts may include the sheet metal,the transmission,or the chassis.新部件可能包括钢壳，变速器或底盘。 Can chassis and whole-vehicle manufacturers co-exist peacefully?底盘企业和整车企业能相安无事吗？

28 clearance
n.净空；许可(证)；清算；清除，清理
参考例句：
There was a clearance of only ten centimetres between the two walls.两堵墙之间只有十厘米的空隙。 The ship sailed as soon as it got clearance. 那艘船一办好离港手续立刻启航了。

29 fixed
adj.固定的，不变的，准备好的；(计算机)固定的
参考例句：
Have you two fixed on a date for the wedding yet?你们俩选定婚期了吗？ Once the aim is fixed,we should not change it arbitrarily.目标一旦确定，我们就不应该随意改变。

30 dynamics
n.力学，动力学，动力，原动力；动态
参考例句：
In order to succeed,you must master complicated knowledge of dynamics.要取得胜利，你必须掌握很复杂的动力学知识。 Dynamics is a discipline that cannot be mastered without extensive practice.动力学是一门不做大量习题就不能掌握的学科。

31 viscosity
n.粘度，粘性
参考例句：
The viscosity shows a rather pronounced variation with temperature.温度对粘度的影响十分明显。 The reciprocal of viscosity is known as fluidity.粘度的反意就是流动性。

32 parameters
因素，特征；界限；（限定性的）因素( parameter的名词复数 )；参量；参项；决定因素
参考例句：
We have to work within the parameters of time. 我们的工作受时间所限。 See parameters.cpp for a compilable example. This is part of the Spirit distribution. 可编译例子见parameters.cpp.这是Spirit分发包的组成部分。

33 module
n.组件，模块，模件；(航天器的)舱
参考例句：
The centre module displays traffic guidance information.中央模块显示交通引导信息。 Two large tanks in the service module held liquid oxygen.服务舱的两个大气瓶中装有液态氧。

34 reciprocating
adj.往复的；来回的；交替的；摆动的v.报答，酬答( reciprocate的现在分词 )；（机器的部件）直线往复运动
参考例句：
Dynamic loading is produced by seismic forces, non-steady wind, blast, reciprocating machinery. 动荷载是由于地震力、不稳定的风、冲击波，往复式机器所产生。来自辞典例句 The prime mover may be a gas reciprocating engine. 原动机可能是燃气往复式发动机。来自辞典例句

35 inverse
adj.相反的，倒转的，反转的；n.相反之物；v.倒转
参考例句：
Evil is the inverse of good.恶是善的反面。 When the direct approach failed he tried the inverse.当直接方法失败时，他尝试相反的做法。

36 inversion
n.反向，倒转，倒置
参考例句：
But sometimes there is an unusual weather condition called a temperature inversion.但有时会有一种被称作“温度逆增”的不平常的天气状态。 And finally,we made a discussion on the problems in the cooperative inversion.最后，对联合反演中存在的问题进行了讨论。

37 fluctuation
n.(物价的)波动，涨落；周期性变动；脉动
参考例句：
The erratic fluctuation of market prices are in consequence of unstable economy.经济波动致使市场物价忽起忽落。 Early and adequate drainage is essential if fluctuation occurs.有波动感时，应及早地充分引流。

38 cylinder
n.圆筒，柱(面)，汽缸
参考例句：
What's the volume of this cylinder?这个圆筒的体积有多少？ The cylinder is getting too much gas and not enough air.汽缸里汽油太多而空气不足。

39 analytical
adj.分析的；用分析法的
参考例句：
I have an analytical approach to every survey.对每项调查我都采用分析方法。 As a result,analytical data obtained by analysts were often in disagreement.结果各个分析家所得的分析数据常常不一致。

40 rigid
adj.严格的，死板的；刚硬的，僵硬的
参考例句：
She became as rigid as adamant.她变得如顽石般的固执。 The examination was so rigid that nearly all aspirants were ruled out.考试很严，几乎所有的考生都被淘汰了。

41 nominal
adj.名义上的；(金额、租金)微不足道的
参考例句：
The king was only the nominal head of the state. 国王只是这个国家名义上的元首。 The charge of the box lunch was nominal.午餐盒饭收费很少。

42 technological
adj.技术的；工艺的
参考例句：
A successful company must keep up with the pace of technological change.一家成功的公司必须得跟上技术变革的步伐。 Today,the pace of life is increasing with technological advancements.当今，随着科技进步，生活节奏不断增快。

43 constraint
n.(on)约束，限制；限制(或约束)性的事物
参考例句：
The boy felt constraint in her presence.那男孩在她面前感到局促不安。 The lack of capital is major constraint on activities in the informal sector.资本短缺也是影响非正规部门生产经营的一个重要制约因素。

44 jointed
有接缝的
参考例句：
To embrace her was like embracing a jointed wooden image. 若是拥抱她，那感觉活像拥抱一块木疙瘩。来自英汉文学 It is possible to devise corresponding systematic procedures for rigid jointed frames. 推导出适合于钢架的类似步骤也是可能的。

45 coordinate
adj.同等的，协调的；n.同等者；vt.协作，协调
参考例句：
You must coordinate what you said with what you did.你必须使你的言行一致。 Maybe we can coordinate the relation of them.或许我们可以调和他们之间的关系。

46 radius
n.半径，半径范围；有效航程，范围，界限
参考例句：
He has visited every shop within a radius of two miles.周围两英里以内的店铺他都去过。 We are measuring the radius of the circle.我们正在测量圆的半径。