We'll discuss Nothing in the section called "the Scala Type Hierarchy" in Chapter 7, the Scala Object System, but its name is suggestive!

我们会在《第7章- Scala对象系统》的“scala类型结构”章节讨论Nothing。但是它的名字本身就解释了自己！

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To create authorizations that are meaningful in the topic namespace, a topic object with a 48-character name is mapped to a specific point in the topic hierarchy.

要创建在主题命名空间中有意义的授权，名称为48个字符的主题对象将映射到主题层次结构中的特定点。

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Gets the property name, or the period-delimited hierarchy of property names, that comes before the property name of the data-bound object.

取得属性名称，或位在资料系结物件之属性名称前以句号分隔的属性名称阶层架构。

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