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nub 's definition：the choicest or most essential or most vital part of some idea or experience; "the gist of the prosecutor''s argument"; "the heart and soul of the Republican Party"; "the nub of the story"
nub in Chinese：n.1.(煤等的)小块；瘤子，疖子。2.〔美口〕(故事的)要点；(事、问题的)核心。短语和例子That's the nub of it. 要点就在这里。