afference

例句：

1. 1. The teacher's lecture was a fascinating study of history.
   老师的讲座是一次引人入胜的历史研究。
2. 2.She focused her attention on the task at hand.
   她把注意力集中在手头的任务上。
3. 3.The scientist concentrated his efforts on developing a new drug.
   科学家致力于开发新药。