He said the Earth is like a large mechanical device that will survive only if people living on it know how to operate it correctly.

VOA: special.2010.05.30

There are some large companies like from where I'm from that hire mechanical engineers.

有许多像我家乡的几家大型公司，都招聘机械工程师。

就业很难 - SpeakingMax英语口语达人