1.focus on 致力于；使聚焦于；对（某事或做某事）予以注意；把……作为兴趣中心

例句：It took an extraordinary effort to focus on preparing his classes or correcting his students 'work.
备课和批改学生的作业花费了他很多精力oaN&0]IN4krW.J。

2.persevere v. 坚持；坚忍，熬住；百折不回

例句：She persevered in her idea despite obvious objections raised by friends.
虽然朋友们明确反对，她还是坚持己见RcJtw2n~)h%。