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单词
upsilon particle
释义
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
-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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更新时间:2026/9/15 23:10:05