假设，为了反映Acme成员管理权的限制性因素，您可以对JPA实体做一些调整。
Assume that, to reflect the constraints of the business rules for Acme's membership administration, you would like to make a few adjustments to your JPA entities.
如果你真的考虑购买 Chromebook 当你的第二台随身电脑／上网装置，也许需具备实体键盘反而是相对重要的因素。
If you're considering buying this, having a physical keyboard is probably important to you, too.
了解创建子类型实体和使用它们的三种服务(添加、更新和按标识符查询)的步骤，同时考虑性能因素。
Step through the creation of subtyped entities and three service types that may consume them (add, update, and inquiry by identifier) with performance considerations in mind.
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