Let me tell you about a person I once knew who liked to play card games for money.

VOA: special.2009.10.11

Censorship only comes into play once a text has actually been in circulation for a while, only after a number of readers have found a published text to pose a threat.

控制仅仅是一本书已经出版发行一段时间,一些读者已经发现这印刷的文本,造成威胁时才起作用的。

耶鲁公开课 - 弥尔顿课程节选

and they play each other once at home, once away

它们互相踢一次主场，一次客场，

关于足球联赛 - SpeakingMax英语口语达人

Teams play their group opponents once.

VOA: special.2010.06.09

So once again what this idea is this idea is you yourself should not play a dominated strategy.

所以再次强调,站在我们自己的立场上说,我们不应采用劣势策略

耶鲁公开课 - 博弈论课程节选

Once they take power,of course, then these strategic security interests come into play and historical decisions, the historical truths have to be put aside.

VOA: standard.2010.03.19

It's all over the place, and as soon as I start to play it, at least once we get in to it, you'll say, "Oh, yeah, i've heard that."

我们经常会听到它,只要我一开始放,至少当我们听到主要部分,你们会说,原来这样啊,我以前听过

耶鲁公开课 - 聆听音乐课程节选

This is our first game and we're going to play games throughout the course, sometimes several times a week, sometimes just once a week.

这是第一游戏 整个课程充满了游戏,有时候一周做几次,有时一周一次

耶鲁公开课 - 博弈论课程节选