倒数到零或规定的时间 count down
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.
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.
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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