不过联想并不是通过分月付款形式，而是允许消费者以购买一定的上网时间去支付一半的电脑价款。

Instead of yoking customers to monthly payments, it allows them to pay for half of the computer by buying minutes of Internet access as and when they can afford them.

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研究了变质物品在考虑资金时间价值并且采购费允许滞后支付时的最优经济订货批量问题。

The paper studies the optimal economic order quantity problem of deteriorating items taking account of capital time-value and possible delay in payment of procurement cost.

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如一张100美元的发货票如果用10天的时间支付，买方可以允许扣除2％的价格；但如果在10天的时间内支付不了，2％折扣将会消失。

An invoice for $ 100 might state that the buyer is permitted to deduct 2 percent if payment is made in ten days.

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