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The air has been badly polluted.
空气的污染很严重。
Pollution has become a serious problem.
污染已经成了严重的问题。
There are many natural catastrophes occurring in nature.
自然界里有很多自然灾害发生。
Don't litter.
请不要乱扔东西。
We rely on the Earth for everything we need to survive, so let's take care of it.
我们依赖地球获取我们生存所需的一切东西，因此让我们来细心呵护它。
If we're all prepared to recycle paper, thousands of trees could be saved every day.
如果纸能被循环利用，那么每天千千万万的树木就可被挽救。
People ruin natural beauty.
人类破坏了自然美。
Don't you feel a bit chocked sometimes?
难道你没觉得有时会有点儿喘不过气来吗?
Air pollution can damage the environment.
空气污染会对环境造成危害。
The enviroment here is very pleasing.
这儿的环境真的让人感觉很舒服。
Much of the ground is dotted with green grass.
绿地面积挺大的。
