For example, in my brother's field of pediatric neurosurgery, there are some cities with too many physicians, while others have too few.

比如，在我弟弟所在的小儿神经外科领域，有些城市的医生过多，有些城市的医生则太少。

Dr. Ben Carson rose from poverty to be the head of pediatric neurosurgery at Johns Hopkins Children's Center in Baltimore.

本·卡森博士从贫困中脱颖而出， 成为巴尔的摩约翰霍普金斯儿童中心的儿科神经外科主任。