noun🔗Shareπ介子 Any of three semistable mesons, having positive, negative or neutral charge, composed of up and down quarks/antiquarks."Inside the particle accelerator, scientists observed the fleeting existence of a positively charged pion before it decayed. "在粒子加速器内部，科学家们观察到了一个带正电的π介子短暂存在，然后迅速衰变。physicselementChat with AIVocabulary GamePractice Reading
