specialize
specialise, / ˈspeʃəlaɪz; `spɛʃəlˌaɪz/ v [I, Ipr]
~ (in sth)
(a) be or become a specialist 成为专家; 专门从事; 专攻
He specializes in oriental history. 他专门研究东方史.
(b) give particular attention to (a subject, product, etc); be well-known for 专注於（某项目、 产品等）; 以...闻名
This shop specializes in chocolates. 这个商店专门出售巧克力.