重点讲解：
1. throw away 扔掉，丢掉；
例句：Do not throw away your advantages.
不要放弃你的有利条件。
2. come back 回来；
例句：There is no telling when she will come back.
说不准她什么时候回来。
3. right now 现在；此时此刻；
例句：I'll lay odds that Dean is at your office right now.
我敢打赌迪安现在就在你办公室。
4. change one's mind （使）改变主意；（使）改变决定；
例句：He was surely about to change his mind.
他一定会改变主意。