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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。
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。
