specialize

Most law students choose to specialize in corporate law or criminal defense after their first year.

(Chinese) 大多数法学系学生在第一年后选择专攻公司法或刑事辩护。

This Italian restaurant doesn't serve French food; they specialize in handmade pasta and pizza.

(Chinese) 这家意大利餐厅不提供法国菜；他们专门经营手工意大利面和比萨饼。