例句：

　　They've switched off the power.

　　他們關(guān)掉了電源。

　　She's better off without him.

　　沒有他，她活得更幸福。

　　He shrugged off the criticism.

　　他對批評不予理睬。

　　Suddenly the lights went off.

　　燈突然熄滅了。