水污染

　　A: Is the lake very polluted?

　　A.这个湖污染严重吗？

　　B: Well, I wouldn't swim in it- but the water is much cleaner than it was a few years ago.

　　B:哦，我没法在里面游泳，但是比前几年清洁多了。

　　A: Are local factories allowed to discharge waste water into the lake?

　　A:允许当地工厂把废水直接排放到湖中吗？

　　B: Yes, but it must be treated in an effluent treatment plant first.

　　B:是,但是废水必须首先进入污水处理厂处理。