中子数减少
The number of neutrons decreases.
以上为机器翻译结果，长、整句建议使用 人工翻译 。
PCR是一座反应堆的核中子数会在反应堆能量增加后增加或减少的衡量标志。
The power coefficient of reactivity (PCR) is a measure of whether a particular reactor's nuclear neutron population will tend to increase or decrease after an increase in the reactor's power.
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