一开始，从 LINEITEM 表中提取规定时期内通过邮寄或海运发货的行项目所对应的订单号。

Initially, order keys corresponding to line items shipped by mail or sea during the qualifying time period are extracted from the LINEITEM table.

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我们相信你方明白那个订单在规定时间内发货，因为任何延误会导致我们损失惨重。

We trust you will see to it that the order is shipped within the stipulated time, as any delay would cause us no little financial loss.

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