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.
双语例句
例： a University professor who specializes in the history of the Russian empire.
一位专门研究沙俄历史的大学教授。