在当今世界，几乎每个人都知道空气污染和水污染对人们的健康有害。
In today's world, almost everyone knows that air pollution and water pollution are harmful to people's health.
被污染的空气有害健康，所以我们是时候采取行动保护环境了。
The polluted air becomes poisonous to health, so it is the high time that we took actions to protect the environment.
空气污染对我们的健康有害。
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