extraadj.额外的n.额外之物;临时演员adv.特别地
extracorporeal circulation operation体外循环术
extra-low-carbon stainless steel超低碳不锈钢
extracorporeal circulation apparatus体外循环装置
extracapsular extraction of cataract白内障囊外摘出术
extra-curriculum physical exercise课外体育
extraordinarily big or impressive.格外的大或者给人印象深刻。
Extra Vehicular Engineering Activity航天器舱外技术作业
Extra-vehicular activity spaceship出舱活动飞船