Bgnice: Run all processes in the background at a lower priority.
bgnice：在后台以更低的优先级运行所有进程。
Effective delegation of lower priority tasks is a time multiplier.
对无需优先的工作进行有效的委托可以“扩大”时间。
That is, lower priority work will suffer more than higher priority work.
也就是说，低优先级工作受到的影响总是要多于高优先级的工作。
Beyond that threshold, lower priority items should get knocked off the list.
超过这一阈值后，优先级较低的特性应当从列表中删除。
Priorities: Less important tasks should start with lower priority (the converse is also true).
优先级：不重要的任务的优先级低(反之亦然)。
Runs background jobs with a lower priority.
以比较低的优先级运行后台工作。
Runs background jobs with a lower priority.
以比较低的优先级运行后台工作。
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