specializing
n. 专攻
v. 使专门化（specialize 的现在分词）
例句
He is a philologist, specializing in American poetry.
他是专攻美国诗歌的语文学家。
《柯林斯英汉双解大词典》
He went on to study music, specializing in the clarinet.
他继续学习音乐，专攻单簧管。
There are some agencies now specializing in helping older people to find jobs which pay.
现在有一些机构专门帮助年纪较大的人找到有酬工作。
