Which means, whenever the stock value reaches reorder level, we have to create purchase order, and the purchased order should be authorized.

这意味着，每当股市值达到订货点水平，我们必须创建采购订单，而购令应该被授权。

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Through the discussion of special cases, we prove that both substitution and reorder can bring profits and reduce the general stock level.

通过对几种特殊情况的讨论和比较，证明了替代和再订货可以提高利润并且可减少库存总量。

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