英语词汇“a knotty problem of long-standing”的翻译、意思、用法、释义-英汉汉英双解词典

词汇	a knotty problem of long-standing
释义	a knotty problem of long-standing 老大难问题
随便看	Uroma Uromaa uromancy uromandelin Uromandelin uromantia uromantical uromastix uromastixes Uromastyx Urombralum uromedina atrata uromelanin uromelus uromere uromeres uromeric urometer urometric urometry Uromi Uromicroprotein Uromicroproteins Uromide uromiro