聚精会神的

例句：

1. 1. He sat there, his eyes fixed on the screen, completely absorbed in the game.
   他坐在那里，眼睛紧盯着屏幕，完全沉浸在游戏中。
2. 2. The teacher asked the students to focus on the lesson and not be distracted by their phones.
   老师要求学生们集中注意力听讲，不要被手机分心。
3. 3. She focused her attention on the task at hand and worked diligently to complete it.
   她把注意力集中在手头的任务上，努力完成它。