nonsmileWiktionary 原文英美构词拆解nonnon-前缀smilesmile词干non-Used in the sense of no or none, to show lack of or failure to perform; or in the sense of not, to negate the meaning of the word to which it is prefixed.词源说明From non- + smile.释义名词noun1A facial expression that is not a (genuine) smile.