老大难[lǎo dà nán]
词典long-standing, big and difficult
老大难[lǎo dà nán]
911chaxun查询·英语单词
long-standing, big and difficult (problem):
例：老大难单位
unit long considered a tough nut to crack; unit known for its difficult problems long regarded as insoluble; a unit with serious and long-standing problems;
老大难问题
question which has long defied solution; problems which have been described as long-standing, big and difficult; a knotty problem of long-standing
1. the most difficult problem：开门整风 open-door rectification | 老大难 the most difficult problem | 廉政建设 to build clean government