Synonyms
- de schwierige frage ➜
- de schwieriges problem ➜
- en difficult problem ➜
- en difficult question ➜
- en perplexity ➜
- fr colle ➜
- fr question difficile ardue ➜
- en puzzle (n, communication) ➜
- en riddle (n, communication) ➜
Links to other resources
- en.wiktionary.org 難問
