Water is the “l(fā)ife blood” of our Earth .It is in every living thing .It is in the air .It runs through mountains and valleys .It forms lakes and sea .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 mouth of a river there is a lot of important plant and animal life .But pollution destroys the life .We have to clean our rivers .

　　水

　　水是我們地球的 "生活血統(tǒng)" 。它在每個(gè)生物中。它在空氣中。它跑過山和山谷。它形成湖和海洋。自然有一個(gè)很棒的水系。雨水到它再到路河和湖。河水跑進(jìn)海洋。在河的嘴，淡水摻加海洋的含鹽甜水.

　　在河里有許多重要的植物和動(dòng)物生態(tài).但是污染破壞生活.我們必須清理我們的河。