Language of this source is a device, and in relation to other devices it's called a "function."

语言是一种工具，和其他工具一样有功能“

耶鲁公开课 - 文学理论导论课程节选

It's a device called a deep brain stimulator, developed by a company called Medtronic, and it looks like a pacemaker that's implanted inside your body.

这个装置叫做深部脑刺激器,由美敦力公司研发,看上去像一个植入体内的起搏器

耶鲁公开课 - 生物医学工程探索课程节选