齿轮 (chǐ lún) — gear

뜻

예문

• 这个机器的齿轮需要更换。
  Zhè ge jī qì de chǐ lún xū yào gēng huàn.
  The gear of this machine needs to be replaced.
• 自行车的齿轮坏了，骑不动了。
  Zì xíng chē de chǐ lún huài le, qí bú dòng le.
  The gear on the bicycle is broken, so I can't ride it.
• 手表的齿轮很小，要小心。
  Shǒu biǎo de chǐ lún hěn xiǎo, yào xiǎo xīn.
  The gear in the watch is very small, so be careful.