1. The teeth of the wheel became disengaged and the machine, out of gear, stopped working. 
   轮齿松开了，机器因齿轮脱开而停止了运行。
2. a gear with a small number of teeth designed to mesh with a larger wheel or rack. 
   带有少量齿轮啮合大车轮和车架的装置。
3. One of a series of teeth, as on the rim of a wheel or gear, whose engagement transmits successive motive force to a corresponding wheel or gear. 
   齿轮的嵌齿一系列齿之一，如在轮或齿轮的边缘上的，其啮合传输连续的运动力到相应的轮或齿轮上
4. A mechanism consisting of a pawl that engages the sloping teeth of a wheel or bar, permitting motion in one direction only. 
   棘轮，棘爪一种包含合于转轮或长条倾斜性齿轮中的爪状物的机械，使轮仅向一个方向运动
5. rolling of wheel and tyre 
   火车车轮和轮箍轧制

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