v.详述，细说( expatiate的过去式和过去分词 )

is expatiated → 阐述了
expatiated on → 阐述了
further expatiated → 进一步阐述

1.His deep knowledge of the historical background enabled him to expatiate upon the significance of the movement.
[汉]他对于历史背景的深刻了解使他能够详细阐述这场运动的意义。
2.The chairman expatiated for two hours on his plans for the company.
[汉]董事长用两小时阐述了公司的规划。