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n.小块;瘤;结节;要点 英英释义: nub[ nʌb ]n.a small lump or protuberance同义词:nubblea small piece"a nub of coal"同义词:stubthe choicest or most essential or most vital part of some idea or experience"the nub of the story"同义词:kernelsubstancecorecenteressencegistheartheart a