件。数量合同有有效期，且可以有取消规则。

A quantity contract has validity periods and can have cancellation rules.

youdao

该交付订单是根据过去对一项未交付时间、未交付数量合同的修正。

These delivery orders are issued under a previously announced contract modification on an existing indefinite delivery, indefinite quantity contract.

youdao

根据2000年2月授予的不定期交付/不确定数量合同，Lot 9订单包括LVT(1)机载和LVT(2)陆基低容量终端。

The Lot 9 order includes LVT(1) airborne and LVT(2) ground-based Low Volume Terminals under the Indefinite Delivery/Indefinite Quantity contract awarded in January 2000.

youdao

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