leftismn.左翼主义；急进主义leftadj.左边的adv.向左n.左边；左派分子；【体】左手拳动词leave的过去式和过去分词形式.Left-behind elderly留守老人left margin of uterus子宫左缘Left hemicolon cancer左半结肠癌Left sublingual gland左舌下腺left-hand operation左侧操作left distributive law左分配律left lateral position左侧卧位,左侧位left ureteral orifice左尿道口left faithful functor左一一的函子Left popliteal artery左腘动脉