You may need to say something when somebody else is speaking, or you may be chairing a discussion where you have to stop one person talking too much. If you start talking at the same time as someone else, this will seem rude. To interrupt politely, you can say, for example 在别人说话时需要插话或主持讨论时某人讲话过多需要打断，直接插话或打断会显得粗鲁，可用一些礼貌的方式，比如：

• ◆ Sorry to interrupt, but I have to disagree with that. 不好意思打断一下，但那一点我得表示异议。
• ◆ Could I just say something here? 我可以插句话吗？
• ◆ If I could, let me stop you there for a moment and go back to your previous point. 请容我打断您一下，回到您先前讲到的一点。
• ◆ Actually, we seem to have strayed a bit from the topic. Can we go back to the first point? 实际上，我们似乎有点偏离了主题。我们可以回到第一点吗？
• ◆ Just a moment, Sue. Can we hear what Jack has to say on this? 稍等一下，休。我们能听听杰克对此怎么说吗？
• ◆ May I interrupt you there? I don't think that's true.(formal) 可以打断你一下吗？我认为那不是事实。
• ◆ I'm sorry, but we're running short on time. Can you please summarize very quickly so we can finish up?(formal) 抱歉，我们的时间不多了。请您快速总结一下我们就结束好吗？
• ◆ I appreciate your enthusiasm on this topic, but I'm afraid we have a couple more people to hear from. (formal) 感谢您对这个话题的热情，但我们还得听听另外几个人的发言。
• ◆ Could you two please discuss that issue privately after the meeting? We have several more items to cover and need to move on at this point. (formal) 请你们两位会后私下讨论那个问题好吗？我们还有几项内容要谈，现在该进入下一项内容了。
• ◆ I'm sorry, I really have to stop you there. We've run out of time.(formal) 抱歉，我必须在此打断你。我们没有时间了。
• ◆ Let's save that conversation for another time. 那事我们下次再谈吧。