这些周期在两种情况下都源于新需求、初始错误的纠正、各种结构化改进，等等。
In both cases, these cycles can result from new requirements, correction of initial mistakes, various types of structural improvements, and so on.
这些周期在两种情况下都源于新需求、初始错误的纠正、各种结构化改进，等等。
In both cases, these cycles can result from new requirements, correction of initial mistakes, various types of structural improvements, and so on.
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