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地球病了

树林 树木的砍伐导致了许多野生动物流离失所。动物没了家园就无法生存。这样下去，我们的后代就只能从图片中观赏各种动物的姿态了。 但更重要的是，植物的光合作用(photosynthesis) 会释放氧气，让我们呼吸清新的空气。植物也能净化空气，使空气更干净！ 没有树木扎根，泥土就会变的松弛。

 

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