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critical mass

1 ENTRIES FOUND:
critical mass noun
plural critical masses
critical mass
noun
plural critical masses
Learner's definition of CRITICAL MASS
[count, noncount]
technical : an amount of material (such as plutonium) that is large enough to allow a nuclear reaction to occur(核链式反应的)临界质量
: the size, number, or amount of something that is needed to cause a particular result(达到预期效果所需要的)大小,数目,数量

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