| 字词 | 老大难 |
| 释义 | 老大难 lǎo dà nán long-standing, big and difficult (problem): 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 |
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