每个周期内的典型任务包括写测试、让代码通过测试、重构代码、提交修改。

Typical tasks in his cycles are writing a test, code to pass the test, refactor the code, commit the changes.

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这样，系统即可在其有用的生命周期中安全地进行修复和重构。

Then, the system can be safely repaired and refactored throughout its useful life.

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建立了RMS的周期成本模型、重构成本模型与全生产周期成本模型。

Models of period cost, reconfiguration cost and the life cycle of RMS are constructed.

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