医学教育费用太高了，人们觉得他们必须专攻。
The costs of medical education are so high that people feel that they've got to specialize.
专攻航空医学的医生。
译者最好有自己专攻的领域，可以是文学、技术、医学和法律等等。
It is best to have a specific field that you specialise in, be it literature, technical, medical, legal.
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