重点讲解：
1. continue doing sth.
继续做原来的事；
eg. They are determined to continue working when they reach retirement age.
他们决定在达到退休年龄后继续工作。
eg. Revenues are expected to continue dropping for at least the next two years.
据估计，在至少未来两年中，收入将持续下降。
eg. It is profitless to continue arguing.
继续争论是无益的。
2. buckle up
扣好安全带；
eg. A sign just ahead of me said, Buckle Up. It's the Law.
我面前的一个牌子上写着：扣好安全带。这是法律规定。
eg. I buckle up all the time for my own safety.
为了自身的安全我都会系上安全带。
eg. Buckle up. Fasten your seat belt.
扣好你的安全带。