专门研究用英语怎么说？

专门研究

例句

• He is making a special study of modern French literature. 他专门研究当代法国文学。
• Thus, specializing in pain made no more sense than specializing in fever. 因此, 专门研究疼痛与专门研究发烧的意义差不多.
• Some criminologists specialize in dermatoglyphics. 一些刑事学家专门研究肤纹学.
• ...a University professor who specializes in the history of the Russian empire. 专门研究俄罗斯帝国历史的大学教授
• My father was a historian of repute. His speciality was the history of Germany... 我的父亲是一名颇有名气的历史学家，他专门研究德国历史。