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   Rosyjski
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do fraz
трудноразрешимая проблемаakcenty
posp. a tough problem; a difficult question to decide; nasty problem; hard-to-solve problem; weighty problem; formidable problem (Азери); Gordian knot (Val_Ships)
makar. tough problem
nauk. difficult challenge (Computerworld Alex_Odeychuk)
polit. persistent problem (ssn)
slang tough egg to crack (Interex)
techn. intractable problem; unsolvable problem
трудноразрешимая проблема: 2 do fraz, 2 tematyki
Ekonomia1
Makarowa1