Could you say that again?
您能再说一遍吗?
Sorry, I missed that. Could you go over that again?
对不起，我没听清，您能重复一遍吗？
Sorry, I didn't catch that. Could you repeat it, please?
对不起，我没听清，您能再说一遍吗？
Sorry, I don't quite see what you mean. Could you explain that, please?
对不起，我不太明白您的意思。请问您能解释一下吗？
I am sorry. I was not paying attention. What was that again?
对不起，我没听清。您刚才说什么？
I don't quite follow you. What exactly do you mean?
我不太明白，您究竟是什么意思？