例如，高优先权执行绪处理时间紧急的工作，而低优先权执行绪执行其他工作。
For example, a high-priority thread manages time-critical tasks, and a low-priority thread performs other tasks.
如果较高优先权的执行绪成为可执行时，则会优先执行较低优先权的执行绪，并允许再次执行较高优先权的执行绪。
If a higher priority thread becomes runnable, the lower priority thread is preempted and the higher priority thread is allowed to execute once again.
如果较高优先权的执行绪成为可执行时，则会优先执行较低优先权的执行绪，并允许再次执行较高优先权的执行绪。
If a higher priority thread becomes runnable, the lower priority thread is preempted and the higher priority thread is allowed to execute once again.
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