如果是在日常口语中一般会说Would you please turn off your computer?这样表达礼貌一些,英语里很少直接说Please turn off your computer.有点命令的语气很不礼貌。不过如果是在飞机上的话,空姐提示也可以这样说:Ladies and gentlemen,the plane is about to take off.Please shut off your cell phones and computers,and make sure that the safety belt is in place.希望对您有用。shut off the computer
就这一种最标准!! 微软都这么说的!
不太标准的:turn off the computer extinguish the computer