转齿轮英语怎么说

转齿轮在英语中可以称为"gear"或"cogwheel"。这个词来源于旧英语中的"gear"，其意思是"装置"或"机械装置"。例如：
The gears on this bike are worn out and need to be replaced.
(这辆自行车的转齿轮已磨损，需要更换。)
The cogwheel on this clock is loose and needs to be tightened.
(这个时钟的转齿轮松动，需要拧紧。)