词语

临渴穿井穿：掘凿。到口渴时才想着凿井。比喻事到临头才急着想办法为时已晚。例夫病已成而后药之乱已成而后治之，譬犹渴而穿井，斗而铸锥，不亦晚乎！——《内经素问》英not dig a well until one thirsty——not make timely preparations;