对象属性范围(全局还是本地)的使用不当。
Misuse of the scope for object attributes (global versus local).
每个Content对象是全局条目类的一个成员，它包含前面提到的所有属性。
Each Content object will then be a member of the global item class, which will contain all of the afore-mentioned properties.
但是，有一些在所有条目上都存在的属性，比如Result对象上的getter，内容上还可能有一些全局定义的字段。
However, there are some properties that exist on all items, such as the getters on the Result object, and there are some globally-defined fields that may exist on our content.
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