The singer was led off the stage by the maestro.

　　歌唱家由那位著名的指揮領(lǐng)著離開了舞臺。

　　Off campus, they faced hostility.

　　在校園之外，他們遭人敵意。

　　The plane took off and ascended steadily until it was out of sight.

　　飛機(jī)起飛之后平穩(wěn)地逐漸升空直到消失在視野之外。

　　He forgot to turn off the gas torch when he left.

　　他離開的時候忘記關(guān)掉氣焊焊炬了。

　　Please switch the lights off as you leave.

　　你離開的時候請把燈關(guān)了。

　　Make sure the central heating is off.

　　集中供暖設(shè)備一定要關(guān)掉。