| 词汇 | critical mass |
| 释义 | critical mass noun [ C usually singular or U ] uk/ˌkrɪt.ɪ.kəl ˈmæs/ us/ˌkrɪt̬.ɪ.kəl ˈmæs/ physics specialized临界质量（实现核子连锁反应所需要的物质的最小量） the smallest amount of matter that is needed to produce a nuclear chain reaction 产生质变所需的量 the size that something needs to reach before a particular change, event, or development can happen |
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