在一瞬间你感到害怕，似乎某事正飞快地发生。

You have fear at the moment like if something is happening quickly.

youdao

孩子们在一瞬间忘记了他们所有的恐惧，所有的痛苦。

The boys forgot all their fears, all their miseries in an instant.

youdao

安全部队在一瞬间突然看见了一群越过了边境的年轻人。

The security forces sighted a group of young men that had crossed the border.

《柯林斯英汉双解大词典》

Right. You really have to have a wise passiveness that moment to really think that every piece of art have that kind of duty behind it.

的确，一个人必须要有这种聪悟的被动,才能在那一瞬间理解到每一个艺术作品,背后都有这个的意义。

普林斯顿公开课 - 人性课程节选

For a moment at least, it's almost as if there were a strange moral equivalence between the palaces up there and the palaces down here.

至少在一瞬间，在天堂的宫殿与地狱的宫殿之间,存在着一种奇怪的道德上的平等。

耶鲁公开课 - 弥尔顿课程节选

In the real world, no one's going to measure it instantaneously, but we can make the difference as small as we like.

在现实生活中,没人能一瞬间测出来,但我们可以使差值越来越小

耶鲁公开课 - 基础物理课程节选