MD

例句：

1. 1. He is an MD and has been practicing medicine for over 20 years.
   他是一名医学博士，已经行医超过20年。
2. 2. She decided to pursue a career in medicine after completing her MD.
   她在完成医学博士后决定追求医学事业。
3. 3. The MD was able to diagnose the patient's condition quickly and provide appropriate treatment.
   这位医学博士能够迅速诊断出患者的病情并提供适当的治疗。