make a specialty of meaning in Chinese

以...为专业, 专攻某学科

But the sight of the little old gentleman with the black teeth and subtle smile whom he suddenly discovered in his armchair behind the group of ladies afforded him a yet more decisive argument . he knew the personage . it was theophile venot , a retired lawyer who had made a specialty of church cases
可是，福什利突然发现一个矮老头儿，满嘴坏牙，脸上堆满狡黠的微笑，他坐在太太们身后的一张扶手椅上，这一发现向他提供了一个更有说服力的论据。