| 释义 |
D particlen.（名词）- Either of two subatomic particles in the meson family, one neutral and one positively charged, having masses 3,649 and 3,658 times that of the electron and average lifetimes of 4.2 × 10-13 and 1.1 × 10 -12 seconds, respectively. D粒子：介子类两种次原子粒中任一种，一种为中性，另一种带正电，质量为电子的3,649和3,658倍，平均寿命分别为4.2×10-13和1.1×10 -12秒
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