存在两种使用支付Web服务进行收费的模式：按流量收费和按批量收费。
There are two modes for charging with the Payment Web service: charge by amount and charge by volume.
在大批量交易的情况下，当进口人销售部分货物以后他须向银行支付部分货款。
In the case of large shipments the importer is required to make partial payments as he sells part of the merchandise.
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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