1) Sports occupy his attention.
他专心于运动。
2) He glues himself to his books.
他专心于书本北。
3) He' s intent on his work.
他正专心于工作。
4) He buried himself in his studies.
他专心于学习。
5) He is devoted entirely to writing.
他专心于写作。
6) They are absorbed in the experiment.
他们专心于实验。
补充资料：他们
1.代词。称自己和对方以外的若干人。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条