turn on/off your phone 开机/关机
You can turn your phone on again now.
现在你又可以开机了。

Turn off the phone, then wait for a while.
关掉手机,然后等一下子。
Please turn off your cell phone or keep it in silent mode when you are participating in some interviews, meetings, negotiations and so on.
当你参加口试、会议、会谈等活动时,请关机或者将手机调到静音模式。
participating [pɑːˈtɪsɪpeɪtɪŋ] v. 参加;参与(participate 的现在分词)
negotiations [nɪˌgəʊʃɪˈeɪʃənz] n. 会谈(negotiation的复数);磋商
switch on/off your phone 开机/关机
switch [swɪtʃ] v. 调换
The first thing she does after waking up in the morning is to switch on her cell phone and find out the latest information.
她每天清晨醒来做的第一件事便是打开手机,理解最新。
Put down your magazine, switch off your mobile phone and concentrate.
放下你的杂志、关掉手机、集中把稳力。
一样平常来说,如果我们想要表达电子设备的开关,比如开/关灯,开/关电视机,直接用 open/close来表达,是不得当的,隧道的说法该当是“Turn on/off”或“Switch on/off”。
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