Epoll 分边缘触发（edge-triggered）和水平触发（level-triggered）两种， 前者只被内核触发一次通知（除非状态被改变为未就绪），后者在触发后如果不做操作， 以后仍...
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Edge trigger 边沿触发 ; 边缘触发
falling edge trigger 负缘触发
edge trigger flip flop 边缘触发触发器
Rising Edge Trigger 正缘触发
edge-trigger phase and frequency detector 边缘触发相位及频率检测器
Double Edge Trigger Counter 双沿触发计数器
Trigger Edge 触发沿
slope of trigger edge 触发沿斜率
FPGA is used as trigger source. The data acquisition of precise timing has been realized with edge-trigger manner. Meanwhile, the data analysis is also realized in the system.
系统采用FPGA作为数据采集触发信号源，实现了精确定时的数据采集，同时对采集的数据进行分析和处理。
However, if somebody already has cardiovascular disease, then it might just tip them over the edge and trigger a heart attack.
但如果有的人本来就有心血管疾病，那这就可能把他们逼到临界点，导致心脏病发作。
If the car activates only the first trigger, the computer knows it is stopped at the edge of the intersection.
如果车辆仅激活第一个触发器，计算机知道车辆已停在了交叉路口的边缘。
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