The idea of reworking your code to improve its maintainability without changing its observable behavior is not new.
修改代码使其易于维护，要求不能修改程序可观察的行为，这个思想并不是全新的理念。
Refactor: to restructure software by applying a series of refactorings without changing its observable behavior.
重构(动词)：就是利用一套重构手段来调整软件结构而不改变其外部表现。
Evidence is made up of facts, statistics, observable behavior, the organization's structure, culture, and strategy.
这些证据来自于事实、统计数据、可见的行为、组织结构、文化及战略。
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