单词 | upsilon particle |
释义 | upsilon particle upsilon particle n.(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&9{-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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