刻舟求剑 (kè zhōu qiú jiàn)

lit. a notch on the side of a boat to locate a sword dropped overboard

Character breakdown

Usage

世界在变,我们不能刻舟求剑。

lit. a notch on the side of a boat to locate a sword dropped overboard (idiom); fig. an action made pointless by changed circumstances

shì jiè zài biàn , wǒ men bù néng kè zhōu qiú jiàn 。