You'll pat your thighs and look wistfully off into the distance, or you'll say something like, "Hmm, makes you think --" when it really didn't, but what you're really --  — what you're really trying to do is change the topic.
你会拍拍大腿然后若有所思的看着远方， 或者你会说，“嗯......”来假装你在思考着， 但实际上－  － 实际上你正在试图切换话题。