Specialization based on expression context-especially void and Boolean context.
基于表达式上下文的特化——尤其是void和boolean上下文。
The expression context is typically the component instance , which is the source of binding values.
典型的表达式上下文就是这个组件实例，它是各种绑定值的来源。
The component itself is usually the expression context, in which case the template expression usually references that component.
通常，组件本身就是表达式的上下文，这种情况下，模板表达式会引用那个组件。
They are restricted to referencing members of the expression context.
它们被局限于只能访问来自表达式上下文中的成员。
The expression context can include objects other than the component. A template reference variable is one such alternative context object.
表达式的上下文可以包括组件之外的对象。模板引用变量就是备选的上下文对象之一。
The expression context can include objects other than the component. A template reference variable is one such alternative context object.
表达式的上下文可以包括组件之外的对象。模板引用变量就是备选的上下文对象之一。
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