4.A: How long have you been in pain?
B: It started to hurt when I was eating dinner.
A: Open your mouth as wide as you can, please.
B: How bad is it?
A: It's quite serious. I'm afraid we'll have to pull the tooth.

A: 你牙疼多久了？
B: 吃晚餐的时候开始疼的。
A: 请尽可能地张开你的嘴。
B: 有多严重？
A: 非常严重。我恐怕不得不把拔牙。

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