He is waxing on about his experiences in Africa again.
(他又在長篇大論地說著他在非洲的經歷了。)
My grandma likes to wax on about the good old days.
(我的祖母喜歡長篇大論地說著過去有多美好。)
Waxing on about how she and her husband met, she suddenly started crying.
(她正長篇大論地說著她和她老公是如何認識的,卻突然哭了起來。)