A LINEITEM table with one row for each item that is part of an order.
lineitem表，一个订单中的每样商品对应一行。
Similarly, the LineItem class has a many-to-one relationship to the product object as well.
类似地，LineItem类与产品对象也具有多对一关系。
Similarly, the LineItem class has a many-to-one relationship to the product object as well.
类似地，LineItem类与产品对象也具有多对一关系。
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