英语词汇“老大難”的翻译、意思、用法、释义-英汉汉英双解词典-爱贷网

词汇	老大難
释义	老大難 lǎo dà nàn形容问题很多,积重难返,不易改进的情况knotty；be hard nut to crack；be long-standing,big and difficult problem老大难的技术问题老大难
随便看	copper ion dopants copper ion doping copper ion implantation Copper ion-imprinted material copper ion in wastewater copper ionization copper ion laser copper ion polishing copper ion releasing type contraceptive ring copper-ion releasing type contraceptive ring copper ions copper ion selective electrode copperioxalate copper i oxalate copperioxide copper i oxide copperirhodanide copper i rhodanide copper iris copper iron copper-iron bimetal copper-iron catalyst Copper Iron Compound Powder copper-iron deposit copper/iron filings