专心地

The student is engrossed in his book.

这名学正在专心致志地看书。

She was absorbed with the mathematical problem.

她专心致志地演算数学题。

Instead of wasting time, she employed herself in reading.

她专心致志地看书, 不白白费时间。

Students are listening with undivided attention.

学们正在专心地听讲。

He sat very erect, listening intently.

他坐得笔直，专心地听 。