此规则的例外情况是当值向下舍入到零时。

An exception to this rule is when a value is rounded down to zero.

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当未完成的任务的总数减少到零时，join() 就会结束阻塞状态。

When the count of unfinished tasks drops to zero, join() unblocks.

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当我们突破光速屏障的时候就会进入到四维空间，而反之速度降低到零时既进入二维空间。

When we break through barriers when the speed of light will enter into the four-dimensional space, and otherwise speed down to zero both into two-dimensional space.

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