summandWiktionary 原文英美构词拆解summsum词干and-and后缀-and(now chiefly dialectal or Scotland) Used to form the present participle of verbs, equivalent to -ing. · (now rarely productive) A suffix of Anglo-Saxon origin forming adjectives from verbs analogous to -ing.词源说明From sum + -and.释义名词noun1Something which is added or summed.