疑難問題 Save Sign in to save words Simplified: 疑难问题 yínánwèntí ㄧˊ ㄋㄢˊ ㄨㄣˋ ㄊㄧˊ knotty problem intractable difficulty Character by character 疑(yí)doubt 難(nán)difficult 問(wèn)ask 題(tí)surname Ti A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0