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。
The length of the time slice depends on the operating system and the processor.
时间量的长度则要视作业系统和处理器而定。
Because each time slice is small, multiple threads appear to be executing at the same time, even if there is only one processor.
由于每段时间极短，因此即使只有一个处理器，多个执行绪看起来还是像同时执行一样。
Because each time slice is small, multiple threads appear to be executing at the same time, even if there is only one processor.
由于每段时间极短，因此即使只有一个处理器，多个执行绪看起来还是像同时执行一样。
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