n.一生，寿命；有生之年；存在期，有效期；na.终生；终身保障；[核]寿命； 变形： 复数：lifetimes 双语释义：n.(名词)[C]一生,存在期 duration of sb's life or sth's existence英英释义： lifetime[ 'laiftaim ]n.the period during which something is functional (as between birth and death)同义词：lifelife-timelifespan