然后，从lineitem表中提取关于订单中尚未发货的各行项目的信息。
Information on individual line items that make up the orders, but are as yet unshipped, is then extracted from the LINEITEM table.
该服务获取尚未发货的购买订单列表，并处理这些订单。
The service retrieves a list of purchase orders not yet shipped and processes them.
接着通过LineitemRevenue stage计算每个未发货的行项目的收益，将它们相加求和，确定每个订单的未付款收益。
The revenue of each individual unshipped line item is calculated by the LineitemRevenue stage, and summed up to determine the pending revenue for each order.
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