The browser should display the customer, the current order, and all the line items (Figure 77).

浏览器应显示该客户、当前的订单和所有的行项目（图 77）。

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For this example, the sample application is a simple customer order system, in which a customer creates an order, adds line items, and then submits the order.

对于本例而言，示例应用程序是一个简单的客户订单系统，在此订单系统中，客户将创建一个订单，添加行项目，然后提交该订单。

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Given a line item, retrieve its associated product, containing order and customer.

给定一个行式项目，检索其相关的产品，包含此行式项目的订单和客户。

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