疑难 yínán difficult; problem Origin Definitions Defs Strokes Stroke Words Sentences Sents 疑难杂症 yínánzázhèng difficult medical cases difficult-to-treat diseases or medical cases with unclear causes疑难解答 yínánjiědá troubleshooting troubleshooting; solution to difficult problems疑难问题 yínánwèntí knotty problem a difficult or complex issue; intractable difficulty; a conundrum