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 ventricular mass左心室质量, 左心室体积left-half hand zero[计] 左边零left atrial abnormity左房异常left quasi regularity左拟正则性left descending aorta左位降主动脉(左位主动脉弓后位型)left atrial dimension左房(内)径left-cutting binder左割捆机left atrial appendage左心耳(左心房的一部分)left identity element左幺元,左单位元素left superior oblique左上斜肌