| 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 |