The polluted air becomes 被污染的空气变得 ; 污染的空气变得
The polluted air becomes poisonous to health, so it is the high time that we took actions to protect the environment.
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。
As a result, a lot of rivers and lakes are polluted, and in some areas, the air also becomes dirty and harmful.
因此，许多河流和湖泊被污染，在一些地区，空气也变得肮脏的和有害的。
The polluted air becomes poisonous and dangerous to health.
被污染的空气有毒而且对身体有害。
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