OPEN, ON = 开

CLOSE, OFF = 关

OPEN THE DOOR

CLOSED THE DOOR

ON THE LIGHT

OFF THE LIGHT

开关 switch

开关的 switched

双开关 biswitch

开关点 switchpoin

转动开关 rotatingsw

停开关 guard

光学开关 optical

双连开关 tumbler

单步开关 single

开关值 switch