VERB
专门从事;专门经营;专门研究;专攻
If you specialize in a thing, you know a lot about it and concentrate a great deal of your time and energy on it, especially in your work or when you are studying or training. You also use specialize to talk about a restaurant which concentrates on a particular type of food.
例句
...a University professor who specializes in the history of the Russian empire.
专门研究俄罗斯帝国历史的大学教授
...a Portuguese restaurant which specializes in seafood.
主打海味的葡萄牙餐馆