So there's a small number of firms and their actions affect each other.

少数几家公司的决策会互相影响

耶鲁公开课 - 博弈论课程节选

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