light switches 电灯开关
switch roles 角色互换
network switches 网络交换机
A: Can you help me find the light switches?
A：你能帮我找找灯的开关吗？
B: Yes, they are right behind the door.
B：好的，就在门后面。
1) 物理开关
2) 网络交换设备
3) 转换或切换的行为
1. 开关；转换
noun
1. a device for making and breaking the connection in an electric circuit.
2. a change from one thing to another.
verb
1. to change position, direction, or function.
Synonym: change, exchange, shift