In a poker game you do not want to let your opponents know if your cards are good or bad.

VOA: special.2009.11.22

So, many of you are new to the Boston area, now I still realize, and I want to let you know it's not required that you be a Red Sox fan to be at MIT.

你们中很多人新来到波士顿地区，现在我仍认识到，我想让你们知道在麻省理工学院,不一定必须做一个红袜队的球迷。

麻省理工公开课 - 化学原理课程节选

Although it's not true that you are speaking French-- let's suppose that you know how to speak French-- it's still true of you while you're asleep that you can or could speak French.

虽然你并不在说法语-,先假设你会说法语-,但是确实在你睡觉时,你是有可能开口说法语的。

耶鲁公开课 - 死亡课程节选