When I need you, you always let me down.

我需要你的时候你总是让我失望透顶。

youdao

You always come through for me when I need you.

你总是在我需要的时候，帮我度过难关。

youdao

When I need you so much you are worlds away from me.

在我最需要你的时候你却在一个远离我的世界。

youdao

"I'm not a believer in resolutions for New Year's. I think that resolutions come when they need to throughout the year, when you decide that someone needs a change."

VOA: special.2009.12.28

All right, so I need to tell you the path, when I go from one state to the other.

好，当我从一个状态过渡到另一个状态时，我需要告诉你们路径。

麻省理工公开课 - 热力学与动力学课程节选

When you say "I must" what you mean is "I need to do something."

当你说 "I must"的时候，你是指“我必须得做某事。”

Must 课堂 - SpeakingMax英语口语达人

And stand when I've called on you -- you don't need to stand before I've called on you, but stand when I've called on you.

WHITEHOUSE: Town Hall in Los Angeles

You are more productive when people are all together, but I think you need to have a little bit of flexibility.

CNN: Tech execs question Yahoo's work-from-the-office edict

When you're playing in slams, I just think each day you need to take as it comes.

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