Non-reentrant functions and static variables.
不可重入函数和静态变量。
Two static variables are involved: the last time you checked for the time and the time itself.
涉及到两个静态变量：您上次检查时间的时间以及时间本身。
Static variables will return to their defaults every time the execution group is started or the message flow is deployed.
在每次启动执行组或部署消息流时，静态变量将恢复为其缺省值。
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