Initially, order keys corresponding to line items shipped by mail or sea during the qualifying time period are extracted from the LINEITEM table.
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。
Qualifying : The period in which drivers are allowed one flying lap to set the best time they can.
排位赛：车手可以在自由行驶的一圈里设定其最好成绩的一个比赛。
Qualifying : The period in which drivers are allowed one flying lap to set the best time they can.
排位赛：车手可以在自由行驶的一圈里设定其最好成绩的一个比赛。
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