However, not all the people know that noise is also a kind of pollution, and that is harmful to human health, too.

然而，并不是所有的人都知道噪音也是一种污染，对人类健康也是有害的。

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Few people know that instant noodles play an important role in hunger and disaster relief.

很少有人知道方便面在饥荒和救灾中发挥着重要作用。

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Many people know that rubbish is a big problem on planet Earth.

许多人都知道垃圾是地球上的一个大问题。

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"These ads do have a huge impact. So many people know that they are watching the Super Bowl not just for the game but for the ads, that they are paying close attention to the ads and to the messages."

VOA: standard.2010.01.27

How many people know that three times a week physical exercise,30 minutes each time has the same effect ? as our most powerful psychiatric drugs?

多少人知道，每周三次,体育锻炼，每次三十分钟，与最强劲的精神药物,有同样的效果？

哈佛公开课 - 幸福课课程节选

You have to put a citation in there so that people know that you're not trying to plagiarize it,

你要在文中标明引用，让人们知道你不是想要抄袭，

抄袭是很严重的问题 - SpeakingMax英语口语达人

The most challenging piece is just letting people know that you have a show coming out.

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Such people know that a low-paying job can be the best path to a high-paying job.

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So that people know that emitting carbon is expensive and they thus stop boiling Gaia.

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