1. a hinged device that fits into a notch of a ratchet to move a wheel forward or prevent it from moving backward. 
   推动车轮向前或阻止向后移动的嵌在棘齿凹巢的铰链装置。
2. A hinged or pivoted device adapted to fit into a notch of a ratchet wheel to impart forward motion or prevent backward motion. 
   掣爪，棘爪一种枢轴或转轴器械，能与齿轮缺口或齿间吻合来前进或防止后移
3. A projection on a machine part, such as a pawl for controlling the motion of a ratchet wheel in a watch escapement, that engages the teeth of a ratchet wheel to convert reciprocating motion to rotary motion or vice versa. 
   棘爪机器部件上的一个突出部分，例如在一个观察棘轮装置中控制棘轮运转的棘爪，用来衔接棘轮的齿，以将往复运动转换为旋转运动；反之亦然
4. rubber ring around the rim of an automobile wheel. 
   汽车轮缘外边的橡皮环。
5. This wheel engage with that wheel and turns it. 
   这个轮子与那个轮子啮合，并使它转动。

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  ratchet wheel pawl weight 棘轮掣子锤...ratchet wheel ring 大钢轮衬圈...ratchet wheel 棘轮, 制逆轮
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