It seemed to be as he said, like intense concentration.

She had a vague sense of his intense concentration but could not read him.

She had a look of intense concentration on her small face.

Especially since he was going to need intense concentration and a very steady hand for the next few hours.

He had a look of intense concentration for several seconds.

He looked at it with intense concentration for a few moments, then left the room.

At 16, the 1983 was beginning to show its intense concentration and depth.

After a moment's intense concentration, Peter began to sense something.

She emerged from her state of intense concentration and met his eyes.

After a moment of intense concentration, she felt no more pain.