与原始版本相比，只有一行绑定定义不同，新版本删除了field属性。
Only one line of the binding definition is different — the field attribute has been removed from the original version.
描述如何检索与控件的特定行绑定的对象。
Describes how to retrieve an object bound to a particular row of the control.
带注解的数据绑定(清单2中的第一行)允许将bean属性声明为组件属性值，这样视图和模型就会自动保持同步。
The Annotated Data Binding (the first line in Listing 2) allows bean properties to be declared as component attribute values so that the view and model are automatically kept in synch.
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