We don't want it to be polluted.
我们不希望它被污染。
Water and air are easy to be polluted.
水和空气容易被污染。
So people should not only save water but also need prevent water to be polluted.
人们不仅应该节约用水更应该防止对本来就很匮乏的淡水资源的污染。
Special attention should be paid to preventing our earth from being polluted.
应该特别注意防止我们的地球被污染。
One must be a sea, to receive a polluted stream without becoming impure.
我们必须是大海，才能接受一条污流而不致变污。
My hometown is not a polluted place (that) you think it to be.
我的家乡不是像你认为的那样，是一个污染严重的地方。
Measures should be taken to stop the river from being polluted.
必须采取措施来防止河流受到污染。
Measures must be taken to prevent the river from being polluted.
必须采取一定的措施阻止河水被污染。
The water polluted by the factory should be to blame.
水被工厂污染应该受到批评。
Polluted, water will be unfit to drink.
如果水被污染，就不适合饮用。
The polluted river used to be very clean.
那条被污染的河流过去很干净。
The polluted river used to be very clean.
那条被污染的河流过去很干净。
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