| 释义 |
e·ta-c particle AHD[āʹtə-sēʹ, ēʹtə-] D.J.[ˈeɪtəˈsiː, ˈiːtə-]K.K.[ˈetəˈsi, ˈitə-]n.（名词）- An electrically neutral meson having a mass 5,832 times that of the electron and a mean lifetime of approximately 3.1 × 10-22 seconds. eta-c粒子：一种质量为电子的5,832倍带电的中性介子，其平均寿命约为3.1 × 10-22秒钟
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