还有一个变量即月光亮度，随着月亮29.5天一周期的盈亏，月亮的亮度会发生变化。

An additional variable is that the moon can have varying degrees of intensity, depending where it is during its 29.5 day cycle of waxing and waning.

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Plan变量的生命周期就是Plan，并且可以在任何脚本或者在不同job的Task中使用。

Plan variables are scoped within a Plan, and can be used within either scripts or Tasks in different jobs.

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ClearCase环境变量也用于这种方法中，ClearCase环境变量存储关于设计好的执行周期的信息。

ClearCase environment variables are also used in this approach. ClearCase environment variables store information about the designed life cycle.

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