1难题近义词汉语:难题, 难点, 难处, 难关, 困难, 难, 艰 汉语:难题, 偏题 西班牙语:pega, rompecabezas英语:difficult problem, puzzle, conundrum, problem
2难事近义词汉语:难事, 难题, 苦事英语:a piece of work, tickler
