- the nub (of something)
the central or essential point of a situation, problem, etc. 中心;要点;实质 The nub of the matter is that business is declining. 问题的核心是营业额在萎缩。 She’s too selfish to help. That’s the nub. 她太自私了,不愿帮忙。这才是重点。
Word Originlate 17th cent.: apparently a variant of dialect knub ‘protuberance’, from Middle Low German knubbe, knobbe ‘knob’.