英语词汇“upsilon particle”是什么意思，“upsilon particle”的读音、用法及例句翻译-烛光网

词汇	upsilon particle
释义	upsilon particlen.（名词） An electrically neutral meson having a mass 18,513 times that of the electron and a mean lifetime of approximately 8.0 × 10^-20 seconds. γ微粒：为电中性的介子，其质量是电子的18,513倍，平均寿命约为8.0 * 10-²⁰ 秒
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