It may come as a surprise to many an exhausted mother or father--but thinking about your children could improve your memory,a study suggests.
这里的 an 和 but 要怎么理解?
《高考英语备考1号·速效编》
《高考英语备考1号·写作编》
《高中英语晨读晚记》
《高中英语错题笔记》
《零起点考大学英语》