机芯 (jī xīn) — movement (of a watch or clock); mechanism (of a device)

Definition

Examples

• 这块手表的机芯非常精密。
  Zhè kuài shǒu biǎo de jī xīn fēi cháng jīng mì.
  The movement of this watch is very precise.
• 修表师傅正在检查机芯。
  Xiū biǎo shī fu zhèng zài jiǎn chá jī xīn.
  The watch repairman is checking the movement.
• 这个闹钟的机芯坏了，需要换一个新的。
  Zhè ge nào zhōng de jī xīn huài le, xū yào huàn yí gè xīn de.
  The movement of this alarm clock is broken; it needs to be replaced with a new one.