perpetualadj.永久的;永恒的;一再往复的
perpetual deformation永久变形
perpetual leaseholder永久租借人
perpetual guardianship终身监护制
Perpetual rejuvenation长生不老
Perpetual American put永久美式看跌期权
perpetually frozen soil永久冻土
perpetual frost climate永冻气候
Perpetual Intermediates永久的中间用户
perpetual American call永久美式看涨期权
perpetual fire insurance[经] 长期火灾保险, 永续保险