The doctor asked the student what he was doing now.
The old student said, "I am a veterinarian now.
The doctor was puzzled and laughed: "Veterinarian? How did you become a veterinarian? It's a shame. Look at me, I'm a real doctor now. All right, enough about that. Where are you not feeling well?
Veterinarian: "Moo, moo.
The doctor continued to impatiently ask the vet what was wrong with him, and the vet just said, "Moo, moo.
The doctor said, "How can I help you if you don't tell me where you don't feel well?
The vet smiled and said, "You see, is it good to be a vet? My patients never tell me what's wrong with them. ......"