| 单词 | critical mass |
| 释义 | critical mass noun [C usually singular or U] specialized ■the smallest amount of matter that is needed to produce a nuclear chain reaction 临界质量（引发核子连锁反应所需要的物质的最小量） ■the size that something needs to reach before a particular change, event or development can happen 某一变化、事件或发展出现或发生前，某物必先达到的量 |
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