重点讲解：
1. hand back 归还；交还；
Don't forget to hand back your book before you leave the reading room.
离开阅览室之前别忘了把书还回去。
2. beef up 改善；加强；改进；提高；
Banks will also be required to beef up their risk management practices.
该计划还将要求各银行加强其风险管理措施。
3. prepare for 为…做准备；筹备；
We need to prepare for this in advance.
我们必须预先为此做好准备。
4. except for 除了；除…之外；唯有；
Everyone was late, except for Richard.
除了理查德，其他所有人都迟到了。