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。
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。
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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