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重点讲解：
1. take off (飞机)起飞；
Three planes were standing on the tarmac, waiting to take off.
三架飞机停在跑道上，等候起飞。
2. thanks to 幸亏；归因于；
It is thanks to this committee that many new sponsors have come forward.
又有许多赞助商找上门来，这要归功于这个委员会。
3. be supposed to do sth. 本应该(发生而没有发生)；
He was supposed to go back to Bergen on the last bus, but of course the accident prevented him.
他本来要乘最后一班汽车回卑尔根，但当然，这起事故使他没能回去。
4. go back on 违（约）；食（言）；违背（诺言等）；
The budget crisis has forced the President to go back on his word.
预算危机迫使总统违背自己的承诺。
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