成年人绝不该在孩子面前说或者做任何错误的事情，以免给孩子们树立不好的榜样。
Grown people should never say or do anything wrong before children, lest they should set them a bad example.
我们应该做些什么来阻止人们对环境做一些不好的事情。
We should do something to stop people from doing bad things to the environment.
我们应该做些什么来阻止人们对环境做一些不好的事情。
We should do something to stop people from doing bad things to the environment.
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