重点讲解：
1. because of 因为；由于；
She's been dropped from the team because of injury.
她因受伤而未被列入队员名单~BjxD.(W+M2d;Qf。
2. once again 又一次；再次；
Unemployment is once again in the spotlight.
失业问题再次受到人们的关注=c^U(2WHJy%=。
3. weigh in 参加,参与(讨论等)；对…发表意见；
We all weighed in with our suggestions.
我们都提出了建议4C7FVE.UsVO=W。
4. be exempt from 被免除的；被豁免的；
Some students are exempt from certain exams.
有的学生可免除某些考试+t,cpa,...VHI0rEAv。