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Teacher:
John, what are you doing? 
约翰，你在干嘛？
John:
Teacher, I…I did nothing.
老师，我…..我没干嘛。
Teacher:
Then what is it on your hand?
那你手上是什么东西？
John:
Nothing, really.
没什么,真的。
Teacher:
Don’t try to hide it, I have seen it. Smoking is very bad for our health, even can cause cancer.
别藏了，我都看到了，抽烟可不好，对我们的身体有很大危害，甚至会引起癌症。
John:
Sorry,sir, I am just curious on it.
老师，对不起，我只是好奇而已。