- a troublesome problem
- 难: catastrophe; calamity; disas ...
- 问题: question; problem
- 困难问题: a hard row to hoe
- 老大难问题: a knotty problem of long standing; hard nut to crack
- 两难问题: dilemma in the proce of coordinating economic and social development; dilemma in the process of coordinating economic and social development; double-barreled question
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