Eachyear500millionpe的知识精选

Eachyear,500millionpeoplefrom164countriescelebrateWorld...
问题详情:Eachyear,500millionpeoplefrom164countriescelebrateWorldEnvironmentDayon5June.Itmayseemlikethereisnotmuchthatanindividualcandotosavetheworld,butthereis.Oneofthefirststepsistounderstandtheproble...
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