...受到越来越严重的威胁和破坏； (habitat/environment; be affected/be threatened/be destroyed) （2）空气被污染(get polluted) （3）大量的树木被砍伐，森林被破坏；(cut down; face the loss of) （4）部分动物的数量在下降(be decreasing),有的则正在逐渐...
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When our sources of fresh water get polluted, we can no longer use this water.
当我们的淡水来源被污染，我们就不能再使用这些水。
Many people get sick because they drink the polluted water.
很多人生病是因为他们喝被污染的水。
To make Beijing our worthy capital, we must get it cleanse of polluted air, among other things.
为了使北京成为名副其实的首都，最主要的是必须彻底清楚空气污染。
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