The door blew open, letting in a rush of cold air.

门被风刮开了，一股冷风疾冲进来。

《牛津词典》

I'm not in the habit of letting strangers into my apartment.

我不习惯让陌生人进我家。

《牛津词典》

That's not a problem. It's simply a matter of letting people know in time.

这没问题。不就是及时通知大家么。

《牛津词典》

In everyday speech, holding your cards close to your vest means not letting other know what you are doing or thinking.

VOA: special.2009.11.22

It's an opportunity to deal with those perhaps in a more constructive way, than letting the feeling spiral.

也许可以借这个机会用更有建设性,的方法应对，而不是使负面情绪恶化。

普林斯顿公开课 - 人性课程节选

because they're fighting against letting immigrants coming in and attack us and terrorism.

因为他们反对移民者入境，接着袭击我们，引发恐怖主义。

英国的极右政党 - SpeakingMax英语口语达人

If they concede a goal they must concentrate on not letting in three or four.

BBC: Confidence is key for Scotland

We can do this by opening the borders and letting in more high-skilled workers.

FORBES: How Risky Is The U.S. Level Debt?

Engineers found a cracked pipe letting in standing water which was polluting the system.

BBC: Safe water may return to Broadway on Friday