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Laula:
Do you know what's our teacher's biggest disadvantage? 
你知道我们老师最大的缺点是什么吗？
Mary:
I don't know. What?
我不知道．是什么？
Laula:
It is halitosis.
是口臭
Ｍary:
How do you know that?
你怎么知道？
Laula:
I found that when I asked him a question.Haw-haw.
我问他问题时，发现的．哈哈＾v＾