nub
noun /nʌb/
/nʌb/
[singular]- 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。
词源late 17th cent.: apparently a variant of dialect knub ‘protuberance’, from Middle Low German knubbe, knobbe ‘knob’. - The nub of the matter is that business is declining.