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$ ?# E, t: u' ?9 kSo often people are working hard at the wrong thing. Working on the right thing is probably more important than working hard.
4 K# M" p1 `( c4 L$ `. r很多时候人们努力错了方向，在对的事情上努力可能比努力本身还重要。) z0 f, d# [/ ], Z2 H! t
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6 H C4 u: `+ W9 x' g; dGears are compact, positive-engagement, power transmission elements in gearing transmission, which determine the speed, torque, and direction of rotation of driven machine elements.
8 a* g& A% p+ l( ^, P/ ?, r句意：在啮合传动中，齿轮是一种结构紧凑的、强制性啮合的动力传输元件，它可以决定速度、转矩和被驱动的机器零件的旋转方向。
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6 T5 c: [7 C# |4 ]! paccommodate [ə'kɔmədeit] v. 容纳；使适应；为…提供住宿 J% ?/ `* @4 O/ R# a% D' e. s g
addendum [ə'dendəm] n. 齿顶高 v- ^, U' q; _" o
axial pitch 轴向节距+ \. |0 ]7 g( c [: Q4 {$ A
backlash [bæklæʃ] n. 侧隙
. W# {1 e/ @# e* ^base circle 基圆
9 `: s4 j4 X' E0 h- ^base pitch 基节* }. F6 N, Z+ f u/ o% t
bevel gear 锥齿轮; a9 W6 o: v# ?8 _& I
circular pitch 周节
* I9 x0 ]# z2 W0 |dedendum [di'dendəm] n. 齿根高
3 x* Q' {5 v, H% |5 v$ @9 J. vdiametral pitch 径节
! a6 X5 n$ G' r5 U [differential [ˌdifə'renʃəl] adj. 差别的，区别的 n. 差别，差异；微分
$ [" X6 _$ d, d$ ?double-enveloping 二次包络
: ^1 ~- P x6 Iface width 齿宽3 y& K9 M( {& J$ T( X! d0 x# V
flank [flæŋk] n. 侧面$ n/ u' K% Y; X# D0 O9 x8 u- z% v$ T
geometry [dʒi'ɔmitri] n. 几何，几何学' h. c9 D- ]$ Q x: d
helical gear 斜齿轮0 @5 G9 F. S- k5 R: \
hypoid gear 伞齿轮
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