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单词
annihilation radiation
释义
WordReference Random House Unabridged Dictionary of American English © 2024
annihila
′
tion radia′tion,
[
Physics.
]
Physics
electromagnetic radiation produced by the coalescence and mutual annihilation of a positron and an electron, each pair forming two photons having a minimum energy of 0.5 million electron volts each.
1960–65
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更新时间:2026/4/22 2:54:54