Admonish your friends in private, praise them in public.
在私底下要忠告你的朋友,在公开场合又表扬你的朋友。
Yes, I see. How can they get rid of waste water in this way? What a terrible colour the sea is now! It looks as if our class won't be able to bathe at all.
是的,我看见了。他们怎么能这样排放废水呢?海水的颜色多么可怕呀!看来我们班同学根本不能在这里游泳。