I didn't understand until he elaborated on the question.

经他一说，我才明白。

"Easy" is a subjective concept that's not elaborated.

“易于”是一个主观的概念，是无法详细描述的。

When I write my paper those will be elaborated upon.

当我撰写论文时，我会就此详细阐明的。

He elaborated a systematic account of mind and history.

他创建了自己的一套，思想和历史的系统。

He never elaborated on what kind of attitude he thought I had.

他从来没有详细阐述了什么样的态度，他认为我有。