gearbox head

例句：

1. 1.The car's engine is a complex gearbox system.
   这辆车的引擎是一个复杂的齿轮箱系统。
2. 2. The mechanic replaced the gearbox head with a new one.
   技师用一个新的齿轮箱头替换了旧的。
3. 3.He was so focused on his work that he didn't notice the gearbox head was missing.
   他太专注于工作了，以至于没有注意到齿轮箱头不见了。