perpetualadj.永久的；永恒的；一再往复的perpetual contingent claim永久未定权益perpetual inventory record永续存货记录perpetually renewable lease永久可重新签订的租约perpetual tutelage of women妇女终身监护perpetual resale restrictio永久转售限制perpetual inventory account永续盘存帐户perpetual American contingent永久美式期权perpetual bituminous pavements长寿命沥青路面perpetual span in English reading英语阅读知觉广度perpetual span in Chinese reading汉语阅读知觉广度