The block becomes magnetic when the current is switched on.
一通上电流，这块板就会有磁性。
Think how bright it is when it is switched on!
试想一下，当它打开的时候会发出多大的光亮。
In Paris, when spring comes it's like someone has switched on the light.
而在巴黎，春光来临时就像有人打开了灯。
An event generated by the window server when the machine is switched on.
启动事件：开机时候窗口服务器产生的一个事件。
When I switched on the light, I found the room had been robbed.
当我打开电灯时发现房间被洗劫过了。
Avoid unnecessary contact with the antenna when the phone is switched on.
开机时避免与天线不必要的接触。
When he came into the room, he switched on the light.
当他走进房间时，他把灯打开了。
When he came into the room, he switched on the light.
当他走进房间时，他把灯打开了。
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