Zuckerberg testimony

On occasion: sometimes but not often

On occasion prisoners were allowed visits from their families.

Several questions displayed an ignorance about the very basics of the platform and its business model.

议员们提出的问题表明他们对这一平台及其商业模式一无所知。

List off: to recite a list of people or things, one by one

She listed everyone off in order without having to look at her notes. 

Evade: to avoid talking about something, especially because you are trying to hide something

evade the issue

evading your responsibilities

Disparate-Disparity

: things are clearly different from each other in quality or type. (FORMAL)

Scientists are trying to pull together disparate ideas in astronomy...