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单词 upsilon particle
释义 upsilon particlen.(名词)
  1. 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
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