错误修正、添加、移除及初始化同步复制都是费事的，且相关操作创建实例间的紧耦合。

Fault fixing, adding, removing, and initially synchronizing replicates are all expensive and involved operations that create tight coupling between instances.

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因此，若无密码键入，传递到该函数的是未初始化的变量和脚本错误结果。

Hence, with no password entered, the function is passed an uninitialized variable and a script error results.

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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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Initialization. A very common bug is to initialize a variable. Go through a loop, and then forget to reinitialize it when it needs to be reinitialized again.

忘记初始化,忘记初始化变量是一个很常见的错误,运行完一个循环之后,当需要再次初始化时。

麻省理工公开课 - 计算机科学及编程导论课程节选