1. in the field of education 在教育领域
2. in the year 551 B.C. 在公元前551年
3. a great thinker 一名伟大的思想家
4.in one’s twenties / thirties
7. be the pride of 是...的骄傲
8. play an important role / part in
9. succeed in doing sth 成功地做...
10. die of / from illness 死于疾病
11. graduate from... 毕业于...
12. make a contribution(s) to sth
15. in charge of 掌管/负责...
17. travel across the Pacific Ocean to the United States for further study
19. at the end of 在...末(结尾)