Meanwhile the pions quickly decay into mu mesons, or muons, which penetrate to the ground.
Meanwhile the pions quickly decay into mu mesons, or muons, which penetrate to the ground.
同时，π介子会快速衰变成缈子抵达地面。
Meanwhile the pions quickly decay into mu mesons, or muons, which penetrate to the ground.
同时，π介子会快速衰变成缈子抵达地面。