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трудная проблемаstresses
gen. poser; hairy problem; riddle; complex problem
dipl. intricate problem; knotty problem; knotty question
Makarov. complicated problem
media. thorny problem (bigmaxus)
psychol. difficult problem; hard problem; tough problem
rhetor. complicated problem (Alex_Odeychuk)
трудная проблема: 11 phrases in 6 subjects
American usage, not spelling1
Diplomacy2
General2
Makarov3
Mathematics2
Philosophy1