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