C134

Professor Sun patted Professor Qin on the shoulder.

Professor Qin looked gratefully at his old friend, took a few deep breaths, and said, "That street isn't long. Usually, it's only two minutes' walk or so, but no matter how I run that day, the distance still doesn't seem to change. I can already see the lights at the end of the street, but I can't get there." Looking back at the car