Wolves are in danger because people cut down forests.
因为人们砍伐森林，狼正处于危险中。
If people cut down forests, many trees and other plants will disappear forever.
如果人们砍伐森林，很多树和其它植物将会永远消失。
We know that if too many trees are cut down, forests will disappear.
我们都知道如果砍伐太多的树木，森林就会消失。
Rain forests around the world are being cut down to make room for humans.
世界各地的热带雨林被砍伐，为人类。
Rain forests are reported to be being cut down rapidly.
据报道雨林正被迅速地砍伐。
We _______ cut down the forests.
我们不应该砍伐森林。
We know that if too many trees are cut down, forests will disappear.
假如没有节制的砍伐太多的林木，森林将会消失，这个我们都知道。
Forests have been cut down, rivers have silted up;
森林遭受砍伐，而河流淤泥充塞。
Forests have been cut down, rivers have silted up;
森林遭受砍伐，而河流淤泥充塞。
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