Grammar Note
介词 in 不可省略；后接名词或动名词。
专门研究；专攻
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专门研究；专攻
to devote oneself to a particular subject or activity; to become an expert in it
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specialize in
Base
原形
specializes in
3rd person
第三人称单数
specializing in
-ing
现在分词
specialized in
Past
过去式
specialized in
Past participle
过去分词
She specializes in ancient Chinese literature.
她专攻中国古代文学。
He specialized in computer science during college.
他大学期间专攻计算机科学。
They are specializing in renewable energy now.
他们目前正专攻可再生能源。
动词短语，specialize 为规则动词，后接介词 in 再加研究对象。
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介词 in 不可省略；后接名词或动名词。
Dictionary facts from ECDICT.