重点讲解：
1. bet on
打赌；下注；
eg. George began borrowing small sum of money to bet on horses, and before he knew it he was in deep.
乔治开始只借少量的钱赌马，但未等他明白过来，已经陷得很深了。
eg. You often lose out when you bet on horse races.
你在赌马时，常常输掉。
2. be sure of
一定的；必定的；无疑的；确保的；
eg. One thing I am sure of was that she was scared.
有一点我能肯定，那就是她当时被吓到了。
eg. It is said she is quite sure of success.
据说她很有成功的把握。
3. be full up
吃饱的；喝足的；
eg. I can't eat any more; I'm full up.
我不能再吃了，我已经很饱了。
eg. The boy went on eating until he was full up.
那孩子一直吃到肚子饱了为止。
4. eat humble pie
道歉赔不是；承认错误；
eg. Anson was forced to eat humble pie and publicly apologise to her.
安森被迫认错并公开向她道歉。
eg. When he realized his mistake, he had to eat humble pie.
他认识到了自己的错误，只好赔礼道歉。
