Please turn off your mobile phones before the meeting.
关机：turn/switch off
开机：turn /switch on
关╱开（电灯、机器等）都可以用
手机的开、关用英语怎么说比如翻译：会议前,请关上你的手机.
Please turn off your mobile phones before the meeting.
关机：turn/switch off
开机：turn /switch on
关╱开（电灯、机器等）都可以用