glimpse

n. 一瞥,一闪
v. 投以一瞥,闪烁不定

I only caught a glimpse of him sitting in the car, so I can't tell exactly what he looked like.

我只瞥见他坐在车里，所以我无法确切说出他长得什么样。

I glimpsed at her among the crowd before she disappeared from sight.

就在她即将消失在人群里之前，我瞥见了她。