instantaneous

adj. /ˌɪn.stənˈteɪ.ni.əs/ C2

瞬间的；即刻的

Happening or done immediately, without any noticeable delay.

仙境例句

When Alice called them a pack of cards, the effect was instantaneous: they all flew up into the air.

爱丽丝刚说他们只是一副纸牌，效果立竿见影：纸牌全都飞上了天。