Check the bill

核对账单

May I have my bill, please?

我能结账吗？

That's $20 in all.

总共20美元。

Well, I am afraid you have made a mistake. Would you check it again, please?

恐怕你搞错了，能核查一下账单吗？

Let me see. I am terribly sorry, sir. That should be $18.

我看看。非常抱歉，先生，应该是18美元。

It doesn't matter.

没关系。