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重点讲解：
1. pay off
偿清，还清（债务）；
eg. It would take him the rest of his life to pay off that loan.
他得用余生来还清那笔贷款。
eg. The man was pressed to pay off his debt.
那人被逼还债。
2. be in a jam
陷入困境；
eg. They were in a real jam, Bob thought glumly.
他们确实遇上麻烦了，鲍勃闷闷不乐地想。
eg. We must help Ernest because he is in a jam.
我们得帮助厄内斯特，因为他陷入了困境。
3. bet on
打赌；下注；
eg. Jockeys are forbidden to bet on the outcome of races.
职业赛马骑师禁止对赛马结果下注。
eg. I bet £10 on a horse called Premonition.
我在一匹名叫“预兆”的赛马上下了10英镑的赌注。
