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Thefactthattreesare vital toourlifeisnosecret.Theyprovi...
问题详情:Thefactthattreesare vital toourlifeisnosecret.Theyprovideuswithfood,woodandmostimportantly,oxygen.Nowthereisonemorethingyoucanaddtothislist-blockingoutharmfulbacteriafromwater. Thedisco...