Asweallknow,treesareimportanttoourlife.Theyprovideuswit...
問題詳情：Asweallknow,treesareimportanttoourlife.Theyprovideuswithfood,woodandmostimportantly,oxygen.Nowthereisonemorethingwecanaddtothislist—blockingoutharmfulbacteriainwater.Thediscoverywasmadebysome...