单词redeclare
Also, the definition of reference remains simple: It doesn"t have to redeclare any of the content that it shares with topic.
此外，reference的定义仍然很简单，不需要声明与topic相同的任何内容。
When you redeclare a property , you specify only the property name, not the type and other information described in "Defining properties. "
当重声明属性时，你只需指定属性名称，而不需要指定类型和其他在“定义属性”中描述的信息。
Use this to redeclare and hide a programming element in a base class.
使用此项来重新声明和隐藏基类中的编程元素。