let in

基本解释

The coating blocks heat from the sun while letting in light.
这种金属涂层能够阻止热能进入室内，同时又让光线进入室内。
Despite letting in some aid, and some foreign relief workers, Burma's government continues to restrict the amount of help that is reaching the victims.
虽然缅甸政府已经允许一部分救援物资和一些外国救援人员进入缅甸，但是它还在限制能够到达灾民手中的援助。
But a plaintive note explaining the closure—thieves have stripped the roof of its copper cladding, letting in rain on the books below—hints at profound changes to the global economy.
但一张哀伤的便笺不仅解释了其闭馆的原因——小偷们把屋顶外层铜质的包层给剥去了，任由雨滴落在下面的书上——它也暗示着全球经济的深刻变化。

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

We can do this by opening the borders and letting in more high-skilled workers.
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If an object lets in something such as air, light, or water, it allows air, light, or water to get into it, for example, because the object has a hole in it. ( )