瞬息 
瞬息 shùnxī {E} adv. in a flash ◆attr. 〈lg.〉 ephemeral
瞬息 瞬息 [shùnxī] in a flash; twinkling; ephemeral 瞬息万变 瞬息万变 [shùnxīwànbiàn] in an instant a myriad changes (idiom); rapid substantial change 瞬息之间 瞬息之间 [shùnxīzhījiān] in the wink of an eye; in a flash 
瞬 瞬 wink / - / eye rose of Sharon wink 息 息 breath / - / nose heart breath 之 之 of / building block / - of 間 间 interval / - / gates day interval