expatiate

动词 expatiate:

1. add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
   同义词：elaborate, lucubrate, exposit, enlarge, flesh out, expand, expound, dilate

1. His deep knowledge of the historical background enabled him to expatiate upon the significance of the movement.
   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.
   董事长用两小时阐述了公司的规划。

ex.pa.ti.ate

v.intr.（不及物动词）
ex.pa.ti.at.ed,ex.pa.ti.at.ing,ex.pa.ti.ates
To speak or write at length:
详述：详细地叙述或描写：
例句：
expatiated on the subject until everyone was bored.
详细地描写那个物体直到每个人都厌烦了

To wander freely.
漫游：自由地到处走动

来源：
Latin expati3ro expati3t-
拉丁语 expati3ro expati3t-
ex- [ex-]
ex- [前缀，表.出自….]
spati3ro [to spread] from spatium [space]
spati3ro [使散开] 源自 spatium [空间]

【引伸】
expa.tia.tion
n.（名词）