unprecedented
adj
without precedent; never having happened, been done or been known before 无前例的; 前所未有的; 空前的
unprecedented levels of unemployment 失业率达到的前所未有的严重程度
a situation unprecedented in the history of the school 该校自有校史以来未曾出现过的情况.
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。
You have to learn when to ask for help and when to ask for information.
你得学会什么时候请求帮助,什么时候打听信息。
Good morning, Mr Coal. I hear that you are one of the best detectives in the capital.