Let's change the subject. 我们换个话题吧! Let's get back to the subject. 言归正传。 I don't want to talk about it now. 我现在不想谈那件事。 Let's talk about it later. 那事儿以后再说吧。 To change the subject... 另外我们说说…… Well, all joking aside,... 好了,玩笑就到此…… By the way,... 顺便提一下…… You were saying? 你刚才说什么来着? That reminds me. 啊,我想起来了。 Let's stop talking. 别说了。 I've heard the story before. 那事儿我听过了。 Let's drop the subject. 这件事别再说了。 Don't say it so loud. 别那么大声说。