Having already chosen to use equal as an assignment, I need something else to do comparison.

既然等号是,用来赋值的，我需要用一些东西来做比较。

麻省理工公开课 - 计算机科学及编程导论课程节选

I thought I still have to work for another 30, 40 years. I need to do something else.

我原本想，我还必须工作三四十年。但我需要做点别的事情。

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We need to add something else in order to explain what is going on in the Periodic Table.

我们需要引其他一些东西进来才能解释清楚,元素周期表中发生的这种现象。

麻省理工公开课 - 固态化学导论课程节选

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