A doctor is already at midnight after completing the emergency and is preparing to go home. Go to the elevator door, see a female nurse, then take the elevator down the stairs together, but the elevator to the first floor is still non-stop, has been down. When it was time for B3, the door opened and the elevator door opened. A little girl appeared in front of them and lowered her head and said that she would take the elevator. The doctor hurriedly closed the elevator door. The nurse asked strangely: "Why don't let her come up." The doctor said: "B3 is the morgue of our hospital. The hospital has tied a red ribbon to the right hand of each body. She The right hand, his right hand has a red ribbon..." The nurse listened, and gradually extended his right hand, and he said with a smile: "Is it a red rope like this?"