疑难问题 yí nán wèn tí

DEFINITIONS

  1. knotty problem
  2. intractable difficulty

CHARACTERS

疑 yí
HSK 4
doubt, question, suspect
难 nán
HSK 3
difficult, arduous, hard; unable
问 wèn
HSK 2
ask about, inquire after
题 tí
HSK 2
forehead; title, headline; theme