ㄌㄧㄤˊliángㄍㄨㄥgōngㄒㄧㄣxīnㄎㄨˇ

  1. 技藝苦心經營·杜甫尊師松樹障子〉:仙客相親良工。」

expert craft from hard practice (idiom)​; hard-won skill, A masterpiece demands suffering.