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单词 critical mass
释义

WordReference Random House Unabridged Dictionary of American English © 2024
critical mass, 
    1. Physicsthe amount of a given fissionable material necessary to sustain a chain reaction at a constant rate.
    2. an amount necessary or sufficient to have a significant effect or to achieve a result:a critical mass of popular support.
    • 1940–45

Collins Concise English Dictionary © HarperCollins Publishers::
critical mass n
  1. the minimum mass of fissionable material that can sustain a nuclear chain reaction
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