因此，在接通用电器具电源的同时也使指示灯(4)通电发光。

So an indicator light (4) is caused to energize and emit light when the power source of the electric appliance is switched on.

youdao

因此，在接通用电器具电源的同时也使指示灯(4)通电发光。

So an indicator light (4) is caused to energize and emit light when the power source of the electric appliance is switched on.

youdao