of one's lifetime一世一代いっせいいちだいいっせいちだいin one's lifetime: in one's lifetime存命中ぞんめいちゅうachieve one's lifetime ambition: 一生｛いっしょう｝をかけた大志｛たいし｝を成し遂げるdo one's lifetime's worth of: 一生分｛いっしょう ぶん｝の～をする
