Are the ship's main radio transmitter aerials earthed and radars switched off? 船上主要的无线电发射天线是否已接地，雷达设备电源是否已断开？
Whenever the machines have been put in working order,they'll keep on doing the jobs they have been"told"to do until they are turned off or break down. 每当机器进入工作状态，它们会把让它们做的工作进行下去，直到电路断开或坏了为止。
He turned off the light before going out. 他出门前把灯关掉。
