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- 问题详情：Treesareusefultomaninthreeimportantways:theygivehimwoodandotherusefulthings,theygivehimcoolplaces,andtheyhelptostopdroughtandflood.Unluckily,inmanypartsoftheworld,manhasnotfoundthatthethirdofthesepointsisthemostimportant.Manwantstomakemoneyfr...
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