If you want to know which part of your brain is responsible for language, you could put somebody into a scanner and have them exposed to language or do a linguistic task or talk or something and then see what parts of their brain are active.

如果你想知道大脑的哪个区域,负责语言功能,你可以对被试进行扫描,让他们暴露在语言环境中,或是进行语言学任务,或者聊天,然后观察他们的哪些脑区处于活跃状态

耶鲁公开课 - 心理学导论课程节选

or, to express the need for somebody else to either do something or have something.

也可以表达其他人做某事的必要或对某物的需求。

I need 课堂 - SpeakingMax英语口语达人

Or a need for somebody else to do or have something.

或者是其他人的类似需求。

I need 课堂 - SpeakingMax英语口语达人

you can use the "you have to" pattern to express something that somebody else really must do.

你可以用“you have to”句型表明一些其他人必须做的事。

have to 课堂 - SpeakingMax英语口语达人