One thing I do ask you: If you are not doing it, if you don't participate, simply just keep quiet.
我对你们的一个要求是:,如果你不做,不参与的同学,请保持安静。
The clouds are really dark and it's getting quiet around the time,
乌云密布,四周都是暴风雨前的宁静。
They are used to obeying rules, they are more quiet.
他们习惯于遵守规则,更加安静。
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