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单词 pion
释义 pion
 /puy"on/, n. Physics.
 the first meson to be discovered: it has spin 0 and may be positively or negatively charged or neutral; charged pions decay into a muon and a neutrino or antineutrino. Symbolically represented by the small greek letter Pi. Also called pi meson.
 [1950-55; PI (MESON) + -ON1]
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