当系统从一执行绪切换至另一执行绪时，它会储存先佔执行绪的执行绪内容，然后重新载入执行绪伫列中下一个执行绪的已存执行绪内容。
When the system switches from one thread to another, it saves the thread context of the preempted thread and reloads the saved thread context of the next thread in the thread queue.
当系统从一执行绪切换至另一执行绪时，它会储存先佔执行绪的执行绪内容，然后重新载入执行绪伫列中下一个执行绪的已存执行绪内容。
When the system switches from one thread to another, it saves the thread context of the preempted thread and reloads the saved thread context of the next thread in the thread queue.
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