机关

公安机关已经开始调查这起杀人案。

The public security authorities have begun investigating the murder case.

他已经在政府机关工作了十五年，积累了丰富的行政管理经验。

He has worked in a government agency for fifteen years and has accumulated extensive experience in public administration.

由于设计了机关门，外人很难进入这个房间。

Because the room has a mechanically operated door, it is difficult for outsiders to get in.

这是一件机关玩具，需要想办法才能解开。

This is a mechanical puzzle toy, and you need to figure out how to open it.