But once a couple is living together, it is harder to split up than if they were merely dating.

但一旦双方住在一起，同当初简单的约会相比，就更难以分开。

youdao

I've found email is a good way to initiate contact, but once a conversation starts it's a bad medium.

我发现电子信函是发起联系的好方法，但是一旦交流开始，它就是一个很糟糕的工具。

youdao

Most ones that I know have very high ethical standards, but once a VC has heard your idea he can't "un-think" it.

我认识的大多数风险投资人都有很高的道德操守，但一旦风险投资人听到了你的创业点子，就再也无法把它从头脑中抹去。

youdao

But Professor Roth says even the best political leaders cannot unite a country once a society's problems get out of control.

VOA: special.2009.12.19

Never go back. Find another. Leave at once. Go for a long trip again, but this time we'll go wherever I want, won't we?" I nodded. My Lolita.

绝不会去，另找一所学校，马上走，再去长途旅行，不过这次去我想去的地方，好吗？“我点头，我的洛丽塔。

耶鲁公开课 - 1945年后的美国小说课程节选

But once in a while, you know, you will come up with a reason that I just cannot argue with.

但有时候呢,你们确实会想出一些我无法辩驳的理由

耶鲁公开课 - 基础物理课程节选

But once a hacker gets past one box, there is little left to stop him.

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But once a user customizes IE, it's difficult to return it to a portal-less state.

CNN: The road to IE5 isn't without bumps

But once a concept becomes an article of faith, important questions and consequences tend to go overlooked.

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