在本部分，我们将介绍什么是业务对象映射以及如何使用它们。
In this section, we show you what business object maps are and how to use them.
Mate的核心是事件映射，它描述了当应用程序分派不同类型的事件时，应该发生什么情况。
The core of Mate is the event map, which describes what should happen when your application dispatches events of different types.
我将首先介绍什么是对象关系映射器(object - relational mapper, ORM)，以及如何创建一对多关系。
I'll start by describing what an object-relational mapper (ORM) is and how to create a one-to-many relationship.
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