persistence of attention

例句：

1. 1.The scientist persisted in his research despitethe lack of funding.
   尽管缺乏资金，这位科学家仍然坚持他的研究。
2. 2. She persisted in her belief that the earth wasflat.
   她坚持认为地球是平的。
3. 3.The teacher's persistence in teachinghelped the students to understand the material better.
   老师的坚持不懈帮助学生更好地理解了材料。