doctor bar

例句：

1. 1. He obtained his doctor bar last year.
   他去年获得了医生执照。
2. 2.She is a licensed nurse and has been working in the hospital for many years.
   她是一名注册护士，已经在医院工作了很多年。
3. 3. The doctor bar exam is one of the most challenging licensing exams in the United States.
   医生执照考试是美国最难的执业许可考试之一。