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同义词： pi-meson
以上来源于: WordNet
N a meson having a positive or negative charge and a rest mass 273.13 times that of the electron, or no charge and a rest mass 264.14 times that of the electron 介子 [physics]
Meanwhile the pions quickly decay into mu mesons, or muons, which penetrate to the ground.
同时，介子会快速衰变成缈子抵达地面。
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Pions are particles created by the collision of the high-energy protons from the supernovas.
FORBES: Scientists Confirm Cosmic Rays Come From Exploding Stars
The pions, in turn, will decay rapidly into very high-energy light, or gamma rays.
BBC: Cosmic rays: Fermi telescope settles mystery of origin
K-longs (around a tenth of a percent of them) were decaying into a mere two pions.
ECONOMIST: What��s the matter?
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