PHRASAL VERB 打开,开启(电灯等) If you switch on a light or other electrical device, you make it start working by operating a switch. 打开,开启(电灯等) [Also VERBPREPOSITION]
She emptied both their mugs and switched on the electric kettle. [VERBPREP. noun]
她把他们俩的杯子倒空,烧上了电水壶。
He pointed the light at his feet and tried to switch it on. [VERB noun PREP.]