Water pollution
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。