In the hardware world, controls like pushbuttons that have mechanical contacts can exhibit what engineers call bounce, which means that the tiny metal contacts of the switch literally bounce when someone presses them.

• 在硬件方面，像按钮那样的控件有机械接触时就会表现出工程师称之为“颤动”的特性。 即当有人按压开关的小金属触点，它们就会颤动。