The inter-type declaration allows you to change the static structure of a program.
类型间声明允许你改变一个程序的动态结构。
A class diagram is a more abstract representation of the structure of a program.
而类图则是对一个程序结构的更抽象的表示。
Refactoring is changing the structure of a program without changing its functionality.
重构是指在不改变程序功能的前提下改变其结构。
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