In many parts of the world, large Numbers of trees have been cut down and the ecological balance of nature has been disturbed.
在世界很多地方，大量的树木遭到砍伐，自然界的生态平衡遭到破坏。
In many parts of the world, large Numbers of trees have been cut down and the ecological balance of nature has been disturbed.
在世界很多地方，大量的树木遭到砍伐，自然界的生态平衡遭到破坏。
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