I’m sorry, but may I interrupt you a few seconds?
(很抱歉,我能打断您一下么?)
If you don’t mind, may I say a word here?
(如果您不介意的话,我想在这儿说上一句。)
Excuse me for interrupting you.
(对不起打断您说话了。)
Just a moment please, I want to say something about the issue.
(稍等下好吗?我想就这个问题说明一下。)