重点讲解：
1. gobble up 狼吞虎咽；贪婪地吃；
As he was still hungry, he gobbled up a second sandwich.
因为还饿，他又狼吞虎咽地吃了第二块三明治WqYL&vHh2LWYA9。
2. all of a sudden 突然地；出乎意料地；
All of a sudden she didn't look sleepy any more.
她突然看起来一点都不困了xf,C6%lq9S7r*mdk.E.K。
3. change one's mind （使）改变主意；（使）改变决定；
I was going to vote for him, but I changed my mind and voted for Reagan.
我原本准备投他的票，后来却改变了主意，把票投给了里根u8IwSka0t0HI8。
4. go wrong 出毛病的，出差错；
When things go wrong, all of us naturally feel disappointed and frustrated.
出问题时，我们大家自然都感到失望和沮丧N_l+2-1s!nF3m.2*qw-)。