意外情况是指导致需要重新安排包裹递送时间的任何事件或情况。
An exception is any event or situation that causes a package delivery to be rescheduled.
配送路线上必须有着足够的顾客，这样才能节约汽油成本、递送时间和行车费用。
Delivery routes must include enough customers to ensure a delivery is worth the cost of gas, driver time, and vehicle costs.
以上代码对于SQL数据库来说是合法的-尽管将递送时间设置为订单时间的昨天是荒谬的。
The above code is legal from a pure SQL database perspective - even though it makes absolutely no sense for the required delivery date of the new order to be entered as yesterday.
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