1) The input signal is sampled when the clock signal is either HIGH or LOW.
2) It is sensitive to Glitches.
Example: Latch.
Edge Trigger:
1) The input signal is sampled at the RISING EDGE or FALLING EDGE of the clock signal.
2) It is not-sensitive to Glitches.
Example: Flipflop.
翻译过来一个叫做条件触发（
Level Trigger），一个叫做边缘处罚 （Edge Trigger）