Note that, because the reorder represents a change in the inventory level of a particular product or products, it is handled as a transaction.

注意，因为订货表现为某种待定的商品或某些商品在清单中的变化，所以把订货作为事务处理。 收藏。

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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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