耕ㄍㄥgēng當ㄉㄤdāng問ㄨㄣˋwèn奴ㄋㄨˊnú

  1. 比喻事有專司，處理事務當問行家。《宋書·卷七七·沈慶之傳》：「治國譬如治家，耕當問奴，織當訪婢。」

英if it's plowing, ask the laborer (idiom)​; when managing a matter, consult the appropriate specialist