go off英音：['gəu ɔf]美音：['go ɔf]
1.響起
The alarm went off.
警鈴驟然響起.
2.變質(zhì)
This milk has gone off.
牛奶變壞了.
3.入睡
Hasn't the baby gone off yet?
嬰孩還沒入睡嗎?
4.進行
The plan went off well.
計劃進行得很順利.
turn on英音：['tə:n ɔn]美音：['tɝn ɑn]
打開;發(fā)動
Will you turn on the radio?
你打開收音機好嗎?
turn off英音：['tə:n ɔf]美音：['tɝn ɔf]
關(guān)掉
Turn off the light before you leave.
離開前請把燈關(guān)掉.
close down英音：['kləuz daun]美音：['kloz daun]
停業(yè)
The shop has already closed down.
那家商店已經(jīng)關(guān)門了.