This is because during the five seconds that the first timer event was sleeping, the timer kept on generating Elapsed events on different worker threads.
这是因为在这5秒期间第一个定时器事件正在睡眠，而定时器却在不同的工作者线程上继续产生时间消失事件。
The biggest difference is that System.Timers.Timer is a wrapper around Win32 waitable timer objects and raises an Elapsed event on a worker thread rather than a Tick event on the UI thread.
最大的区别就在与System.Timers.Timer类是对Win32可等待定时对象的一个包装，并在工作者线程上产生一个时间片消失事件而不是在UI线程上产生一个时间标记事件。
For example, if the interval is set to 5 seconds and 3 seconds have already elapsed before the interval is changed to 10 seconds, the next timer event will be 13 seconds from the last timer event.
比如，设置了一个5秒的间隔，在间隔被改变为10秒时3秒已经过去了，那么下一个定时器事件将会在上一个定时器事件13秒后发生。
When zero is reached, the timer starts counting up to show time elapsed since alarming.
在达到零秒时，计时器便开式正数计时来显示从报警后开始的时间。
Portable electric timer functions as elapsed-time indicator, interval timer and electrical apparatus on-off timer.
便携式电子计时器装有已过时间指示器，间隔计时器和电子开关计时器。
Portable electric timer functions as elapsed-time indicator, interval timer and electrical apparatus on-off timer.
便携式电子计时器装有已过时间指示器，间隔计时器和电子开关计时器。
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