enlarge on/upon something
phrasal verb with enlarge verb uk/ɪnˈlɑːdʒ/ us/ɪnˈlɑːrdʒ/
formal
详述；详细说明
to give more details about something you have said or written
Would you care to enlarge on what you've just said? 您能否再进一步阐述一下您刚才讲过的内容？