- the crux (of something)
the most important or difficult part of a problem or an issue synonym nub(难题或问题的)关键,最难点,症结 Oxford Collocations Dictionaryadjective- real
- be
- lie
- the crux of the matter
- the crux of the problem
Word Originmid 17th cent. (denoting a representation of a cross, chiefly in crux ansata ‘ankh’, literally ‘cross with a handle’): from Latin, literally ‘cross’.