Why is he howling 他为什么要叫唤

Dentist: Please stop howling. I haven't even touched your tooth yet.

Patient: I know. But you are standing on my foot!

牙医：请不要再叫了，我都还没有挨着你的牙齿啊！

病人：但是，亲，你可知道，你踩到我脚了！！！