A:Professor, I've handed in my paper. Did you read it?教授,我的論文已經交了。你看了嗎?
B:Yes. You've done a good job. But there's one thing. You should narrow down your topic.是的。你寫得不錯。但是有一個問題。你應該縮小你的話題。
A:What about water pollution instead of pollution?用“水污染”代替“污染”怎么樣?
B:Well done!非常好!