electric lights kept factories going around the clock.这句话什么意思?里面的go around短语当什么讲，你们解释的没提到clock啊

electric lights kept factories going around the clock.这句话什么意思?里面的go around短语当什么讲，你们解释的没提到clock啊 Who ____ the electric lights?(invent) 翻译：The railway bridge is outlined by bright electric lights the railway bridge is outlined by bright electric lights, electric electric electric electric i think selectric light are the most helpful invention .(对electric lights 提问） Electric equipment and lights作主语时谓语用单数还是复数? lights kept electric fire electric vehicles reduced electric Electric Chapel electric appliance electric咋读