| 释义 |
DEFINITIVE EXAMPLES 权威例句〔gamma decay〕A radioactive process in which an atomic nucleus loses energy by emitting a gamma ray without a change in its atomic or mass numbers.Υ衰变：原子核的一种放射性过程，在这种过程中由于放出一个伽马射线而损失能量，但并不改变原子序数或质量美国传统〔gamma-ray astronomy〕Astronomy that deals with the origin and nature of periodic gamma-ray emissions from extraterrestrial sources.伽马射线天文学：研究来自地球以外来源的定期伽马射线放射的起源和本质的天文学分支美国传统 |