瞬息

yī kē liú xīng huà guo tiān kōng shùn xī jiù xiāo shī le

一颗流星划过天空，瞬息就消失了。

A meteor streaked across the sky and disappeared in the twinkling of an eye.

shùn xī jiān

瞬息间

in the twinkling of an eye

shùn xī wàn biàn

瞬息万变

change rapidly

chéng gōng de jī huì yóu rú yī lǚ qīng yān shùn xī jí shì

成功的机会犹如一缕青烟，瞬息即逝。

Any chance of success seemed to vanish in a puff of smoke.