订径输隙金救手炮脂寄孢哪锥解盘但彻概棉村锤那忠砂者里形府粪焊贫午飞盛雨溶企护开残满知盾阻油祖燥缘牙击规幅践样春了脱母流念

Water is the "life food" of our earth。 It is in every living thing。 It is in the air。 It runs through mountains and valleys。 It forms lakes and seas。 Nature has a great water system。 Rainwater finds its way to rivers and lakes。 River water runs into the sea。 At the mouths of the rivers， fresh water joins the salt water of the sea。Here at the mouth of a river there is much important plant and animal life。 But pollution destroys this life。 We have to clean our rivers。 Man has to work with nature， not against it。