ㄆㄨˋˊshíㄏㄢˊhán

  1. 孟子·告子》:一日。」比喻做事缺乏恆心時常中斷無心課業一天一暴十寒如何?」鍥而不舍持之以恆

one day's sun, ten days' frost (idiom, from Mencius)​; fig. to work for a bit then skimp, sporadic effort, short attention span