sentences:  He also studied at the Royal University in Perugia, from where he obtained a doctoral degree in politics.Yu was ordained to the priesthood on 22 December 1928 by Archbishop Giuseppe Palica, and then taught at the Urbaniana University until 1933, when he returned to China.Upon his return, he was named National Director of Catholic Action, secretary of the Chinese nunciature, and Inspector General of Catholic schools in China.