You need to practise every day.

你需要每天练习。

《牛津词典》

You need to build your self-esteem.

你需要树立自尊心。

《牛津词典》

You need to present yourself better.

你需要更善于展示自己。

《牛津词典》

So exactly how much exercise do you need to do to gain all of these great health effects?

VOA: special.2010.06.08

So any time in a molecular orbital diagram you draw in orbitals, you need to draw the corresponding molecular orbitals.

任何时候你在分子轨道图里画轨道，你都要画出相对应的分子轨道。

麻省理工公开课 - 化学原理课程节选

you are concerned because you have a cold and you need to go work and you want to be seen.

你有点担心，因为你有点感冒，但还是得上班，而你想尽快让医生检查一下。

I don't care课堂 - SpeakingMax英语口语达人

But I was still nervous, because you need to win it big to beat a champion.

BBC: Appleby wins featherweight crown

It's the power and capabilities you need to do business in a slim, attractive package.

ENGADGET: blogger-avatar

To really return to the roots of traditional Welsh food though, you need to go foraging.

BBC: The sophisticated flavours of rural Wales