最简单的：pardon?

麻烦一点的是：I did not hear clearly , would you repeat it once again ?

或：I didn't quite catch that. Could you repeat it please？

扩展资料：

pardon

英 [ˈpɑ:dn]   美 [ˈpɑ:rdn]  

vt. 原谅;赦免;宽恕;劳驾

n. 赦免;饶恕，原谅;[宗]免罪符

int. （用于请求别人重复某事）什么，请再说一遍

例句：

1、'Will you let me open it?' — 'Pardon?' — 'Can I open it?' 

“我乎逗能打开它吗？”——“请再说一遍？”——“我能打首顷皮开它吗？”

2、'Would you get undressed, please?' — 'I beg your pardon?' — 'Will you get undressed?'

“请你脱掉衣服，好吗？”——“你说什么？”——者差“脱掉衣服，好吗？”

3、I was impolite and I do beg your pardon 

我失礼了，真对不起。

4、Pardon me, are you finished, madam? 

对不起，您用完餐了吗，夫人？

5、That, if you'll pardon my saying so, is neither here nor there. 

恕我直言，那根本就不重要。