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critical mass
noun
singularcritical mass
pluralcritical masses
  1. 1
    [singular/uncountable] the smallest number of people or things needed to make something happen (使某事发生所需的)最少数量的人(或物)
     Synonyms and related words
    Small amounts or pieces of something: bit, piece, fragment...
  2. 2
    [C/U] physics the smallest amount of a substance needed to cause a nuclear reaction 临界质量
     Synonyms and related words

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