During closing the switch of cutting-off winding, press starts key the instrument will be a point-motion state until the switch of cutting-off winding is opened.

断线开关闭合时，按下“启动键”机器处于“点动”状态直至断线开关打开。

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With a mechanical keyboard, on the other hand, each key press triggers an actual on-off switch a feeling as solid as flicking on the lights.

WSJ: Keys That Really Click