Definition: a switch that you press to control a piece of equipment Level: B1
只需按下按钮呼叫电梯。
Just press the ___button to call the lift.
发送电子邮件只需点击一下按钮。
Sending an email is just a click of a ___button.
要打开灯，你需要拨动这个开关。
To turn on the light, you need to flip this ___button.
