1) He switched off the recorder.
他关掉了录音机。
2) He neglected to turn on the radio. (turn off)
他忘了关收音机。
3) Turn off the radio.
关掉收音机。
4) What has happened to the recorder?
录音机怎么了?
5) There' s something wrong with the recorder.
录音机出了毛
6) Turn off the video.
把录像机关了。
参考词条