v.詳述；細(xì)說；漫游
His deep knowledge of the historical background enabled him to expatiate upon the significance of the movement. 他對于歷史背景的深刻了解使他能夠詳細(xì)闡述這場運(yùn)動的意義。
The chairman expatiated for two hours on his plans for the company. 董事長用兩小時闡述了公司的規(guī)劃。
