Based on time elapsed or other boosts, the operating system can change the base priority level when a process needs to be put ahead of others for access to the processor.
当需要将某个进程放到其他进程前来访问处理器时，操作系统可基于运行时间或其他提升来更改基本优先级别。
The operating system uses the base-priority level of all executable threads to determine which thread gets the next slice of processor time.
操作系统使用所有可执行线程的基本优先级别来确定哪个线程获取处理器时间的下一个片段。
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