语言具有内部属性和外部属性两个部分。
The language possesses tow sections: the internal property and the external property.
目标函数对调用者的内部属性、方法等不关心。
The caller has no need to access other properties, methods, or interfaces on the object implementing the method.
获取可以保持指定控件的内部属性的数据字符串。
Gets a string of data that can persist the inner properties of the specified control.
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