若前置时间过长，某些器材可在学期开始前订购，但直到学期开始才能认真地装配。

Where lead times are excessive, some equipment may be ordered before the start of the semester, but assembly does not begin in earnest until the semester starts.

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我们祈以计量方法推导出使期望总相关成本最低之最适订购量、请购点、欠拨折扣及前置时间。

The objective is to simultaneously optimize the order quantity, reorder point, back-order discount and lead time.

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