库存天数太高所产生的资金、损耗、过期、滞销、仓储空间、搬运等费用与风险不可等闲视之；库存太低则丧失销售机会，顾客对商场的信心也会降低，更需要全面高度地重视。
现在假设我在一个库存系统中编写订单报告，计算过期的订单数以及这些订单的平均过期天数。
Now let's say I'm writing a report for the orders in an inventory system, computing the number of orders that are overdue and the average numbers of days overdue for those orders.
从国内来看，由于消费旺盛，加上冬末的供暖天数增加，电力公用事业的需求已令煤炭库存开始降低。
Domestically, electric utilities have already started to reduce coal stockpiles as consumption increased with a higher number of heating days at the end of winter.
这些关键绩效指标包括计划执行情况、库存周转率、在制品持有天数、资源利用率、废料、退货等。
Some of the KPIs are Performance to Schedule, Inventory turns, WIP days on hand, Resource Utilization, Scrap, Returns, etc.
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