鼠标、键盘或系统事件，都常用来触发截取屏幕快照。
Mouse, keyboard, or system events are the common triggers for capturing screenshots.
序列也可以触发实时从键盘。
Sequences can be also triggered in real time from the keyboard.
这样的表征就是当你按下一个键是触发了键盘上多个键的线路。
It's behaving as though pressing one key is triggering the circuit for multiple keys on the keyboard.
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