这个词是什么意思？
Electrically neutral elementary particles found in all atomic nuclei except light hydrogen; the mass is equal to that of the proton and electron combined and they are unstable when isolated from the nucleus, undergoing beta decay. Slow, thermal, epithermal, and fast neutrons refer to the energy levels with which the neutrons are ejected from heavier nuclei during their decay.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D009502 · MeSH 2026。
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