... lower-priority goal 较低优先级目标 lower priority interrupt 低优先中断 next lower priority group 次低优先群 ...
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通过线程，可以优先调度重要任务—甚至中断—低优先级任务。
With threads, important tasks can be scheduled to take precedence over-and even interrupt-lower-priority tasks.
如果在响应低优先级中断时高优先级中断使能，用户必须在低优先级中断响应程序中保存那些关键的寄存器值。
If high priority interrupts are not disabled during low priority interrupts, users must save the key registers in software during a low priority interrupt.
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