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。
"Really" learning is predicted to result in observable behavior changes, while "mere" rote learning is predicted to result in little (or different) behavior change.
“真正的”学习结果预计有可见的行为变化，而“仅仅是”死记硬背将导致很小(或不同)的行为变化。
Observable behavior rather than internal thought processes are the focus of study. In particular, learning is manifested by a change in behavior.
研究对象应该是可观察的行为而不是内部思想过程。特别地，学习由行为的变化表征。
Observable behavior rather than internal thought processes are the focus of study. In particular, learning is manifested by a change in behavior.
研究对象应该是可观察的行为而不是内部思想过程。特别地，学习由行为的变化表征。
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