专心地

Students are listening with undivided attention.

学生们正专心地听讲。

He sat very erect, listening intently.

他坐得笔直，专心地听 。

She was absorbed with the mathematical problem.

她专心致志地演算数学题。

The student is engrossed in his book.

这名学生正专心致志地看书。

Instead of wasting time, she employed herself in reading.

她专心致志地看书, 不白白浪费时间。