As we know , water is very important to man, (我们知道，水对人类来说是非常的重要。)we can’t live without water. (没有水我们就不能生存。)The amount of water which is suitable to drink is less and less. (适合人类喝的水是越来越少了。)But some people don’t care about it .(但是有些人却不关心或不在意。)They waste a lot of water in their daily life. (日常生活中他们浪费很多水。)Even worse, they pour dirty water in to rivers.(更糟糕的是他们排放污水到河流里。) They throw rubbish into rivers , too. (他们还乱扔垃圾到河流理去。)Many rivers and lakes are seriously polluted.(很多河流湖泊已经受到严重污染。) Something must be done to stop the pollution. (人类必须采取一些措施来制止污染。)Only in this way can we live happily.(只有这样，我们才过得幸福开心。) If we don’t save water, the last drop of water will be a tear-drop of us.( 如果我们不节约水，那么最后一滴水也许会是我们人类的眼泪)
参考资料：http://www.littleducks.cn/study/yingyu/yingyuzuowen/63529.html