zhuǎn​shùn​jí​shì

fleeting

转瞬即逝 轉瞬即逝 zhuǎn​shùn​jí​shì
fleeting adjective
(idiom) gone in a flash; transitory; to disappear in an instant

Frequency

Movie subtitles
1.10 per million appears in 1% of films
Written text
1.04 per million

Sources