由于音乐场地和观众群体的增加，必须需要采取一些行动。

Something had to be done, because the music venues and the audience kept getting larger and larger.

youdao

成为专家，你必须需要时间与经验。

To become an expert, you need time and experience.

youdao

必须需要类的协作。

The collaboration from classes is needed.

youdao

You handle them very special in terms of being extra careful in a very high ventilation area, in hoods is how you handle them.

在使用它们的时候你需要格外小心,必须在通风条件非常好的地方，在通风柜中才行。

麻省理工公开课 - 化学原理课程节选

In the long run, we want The Wall Street Journal and so I guess that-- we just have to accept that.

但从长远来说,我们需要《华尔街日报》,所以我想,我们必须得接受

耶鲁公开课 - 金融市场课程节选

It would be much better if you had a reference point that didn't care where the pressure was.

我们还需要精确地定义气压,你必须知道气压的大小,当然如果我们能找到一个。

麻省理工公开课 - 热力学与动力学课程节选