1、开关 [kāi guān]：switch derail disjunctor on-off

2、双语例句：I was confronted with an array of knobs, levers, and switches.我面对的是一大堆旋钮、控制杆和开关。Prince Edward threw the switch to light the illuminations.爱德华王子按动开关亮起彩灯。Vicky Brown arrived home to find the men disconnecting her microwave.维基·布朗到家时发现那些人正在断开她微波炉的开关。