如果暂挂一个线程，则其堆栈帧显示为子元素。

If the thread is suspended, its stack frames are shown as child elements.

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在图6中，有5个任务处于暂挂(pending)状态。

In Figure 6, there are 5 jobs in pending status.

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但是这种数据结构并不能使删除或暂挂不再相关的线程变得容易。

But this data structure does nothing to make it easy to remove or suspend threads that are no longer relevant.

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