短語(yǔ)詞組短語(yǔ)a knotty problem 棘手的問題;令人撓頭的事;一個(gè)棘手問題judicial knotty problem 司法疑難問題a knotty problem question etc 難以解決的疑難A knotty problem of long -standing 老大難問題 返回 knotty problem