- 问题详情: Treesareusefultomeninthreeimportantways:Theyprovidethemwithwoodandotherproducts(产品),theygivethemshade(树荫),andtheyhelptopreventdroughtandfloods. Unfortunately,inmanypartsoftheworld,menhavenotrealized(功能)isthemostimportant.Intheireagerness(渴...
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