1. John is a renowned hymnologist who has studied and written extensively about hymns from different religious traditions.
约翰是一位著名的赞美诗学家，他对来自不同宗教传统的赞美诗进行了广泛的研究和撰写。

2. The hymnologist gave a lecture on the history and significance of hymns in church worship.
这位赞美诗学家就教堂崇拜中赞美诗的历史和意义进行了一场讲座。