Agile development methods, which add program features iteratively, depend on refactoring as a technique to alter and extend a program's design.
敏捷开发方法采用迭代方式增加程序特性，因此需要依赖于重构技术来改变和扩展程序的设计。
For really critical sections of your code, you might consider adding some functional tests as a safety net before you start refactoring.
对于代码中真正关键的部分，可能需要在进行重构之前添加一些功能测试作为一种安全保障。
Therefore, this preview does not only serve as a warning as to whether the refactoring should be performed at all.
因此，这个预览图不仅仅是对是否应该执行所有重构的警告。
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