开始倒计时：用一个专门的倒计时器——单单看钟很容易“遗忘”。
Start the timer: Use an actual timer — it’s too easy to “forget” to look at the clock.
秒表——指定开始和停止的计时器。
Stopwatch — specifies a timer that can be started and stopped.
一旦包含的消息流被部署，该节点将立即开始计时，第一个计时器事件将立即发生。
The node begins timings as soon as the containing message flow has been deployed, and the first timer event occurs as soon as the flow is deployed.
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