M.d.

例句：

1. 1. He is a renowned doctor in his field.
   他在其领域是一位著名的医生。
2. 2. She has completed her MD and is now working as a specialist.
   她已经完成了她的医学博士，现在是一名专家。
3. 3. The doctor advised the patient to rest for a few days before undergoing surgery.
   医生建议病人在手术前休息几天。