给定一个订单，返回该订单和带产品的行式项目。
Given an order, return it and the line items with product. This delegates to.
给定一个行式项目，返回该行式项目和产品，这将委托给。
Given a line item, return it and the product, which delegates to.
所需时间仅为几分钟或一小时的任务可能需要集中到更大的行式项目中。
Tasks that are only a few minutes or an hour might need to aggrated into a bigger line item.
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。
Given a line item, retrieve its associated product, containing order and customer.
通常在项目超过时间限度的情况下，人们之间的交流主要集中于将现有的行式项目作为缓冲。
Too often the conversation relegates to the line item having been put there to be a buffer in case of project overruns.
更现实一些，我们应该考虑那些具有更多方法的完整接口，如用于列出和删除行式项目的方法。
To be more realistic, we should contemplate a full interface which has many more methods, such as those for listing and deleting line items.
图10显示了行式项目之间的关系，其中为行式项目定义的角色之一仅仅在其所属的订单内具有唯一性。
Figure 10 shows a relationship between line items in which one of the roles is defined for a line item that is unique only within the Order that contains it.
图10显示了行式项目之间的关系，其中为行式项目定义的角色之一仅仅在其所属的订单内具有唯一性。
Figure 10 shows a relationship between line items in which one of the roles is defined for a line item that is unique only within the Order that contains it.
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