A perpetuity is an asset or a contract that pays a fixed amount of money each time period, forever.

永续年金是一种财产或者合同,规定在每一时间段内,支付一定数量的货币,直至永远

耶鲁公开课 - 金融市场课程节选

There are also survivorship policies that will pay, for example, the second to die-- there would be a policy if a husband and wife get it, then it pays out when the second of them dies.

还有一种叫做生死两全保险,它会向身故受益人赔付直至其死亡,若一对夫妻购买这种保单,且其中一方死亡,那么它会给活着的一方赔付直至其死亡

耶鲁公开课 - 金融市场课程节选