一切调整好之后，您可按一下“预览”来加速24小时回圈，以便查看随时间推移所发生的变化。
Once you have things where you want them, you can click preview to speed through a 24-hour cycle to see a time-lapse of the changes.
您或许会观察到，当两个程序彼此呼叫时，效能可能很差，甚至造成无限回圈。
You might observe very poor performance, or even an infinite loop, if two procedures call each other.
处理序在讯息回圈内等候讯息时，是处于所谓的闲置状态。
A process is said to be in an idle state when it is waiting for messages inside of a message loop.
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