当计数值成为零时，信号对象的状态成为non - signaled。
When the count reaches zero, the state of the semaphore object becomes non-signaled.
Linux使用pthread_condition_init调用在当前进程内创建信号对象，在其中维持一个在零与最大值之间的计数值。
Linux USES the pthread_condition_init call to create a semaphore object within the current process that maintains a count between zero and a maximum value.
当科学家们让实验对象玩一个通过欺骗搭档来赢钱的游戏时，他们注意到来自杏仁核的负面信号开始减少。
When scientists had their subjects play a game in which they won money by deceiving their partner, they noticed the negative signals from the amygdala began to decrease.
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