- 問題詳情:Treesareusefultomaninthreeimportantways:theygivehimwoodandotherusefulthings,theygivehimcoolplaces,andtheyhelptostopdroughtandflood.Unluckily,inmanypartsoftheworld,manhasnotfoundthatthethirdofthesepointsisthemostimportant.Manwantstomakemoneyfr...
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