重点讲解：
1. ahead of 提前；
Thanks to your help, we accomplished the task ahead of schedule.
亏得你们帮忙，我们才提前完成了任务。
2. in the middle of (某件事或某段时间的)中期；
Scientific socialism originated in the middle of the nineteenth century.
科学社会主义创始于19世纪中叶。
3. take in 收留，收容(尤指无家可归者或逃难者)；
The monastery has taken in 26 refugees.
修道院已经收留了26位难民。
4. be subject to 受…支配的；服从于…的；
This matter is subject to joint examination and approval by the Planning Commission and the economic commission.
这件事由计委会同经委审批。