乙种粒子 yǐzhǒnglìzǐ beta particle Definitions Defs Origin Strokes Stroke Words Sentences Sents 乙种 乙種 yǐzhǒng category B type B; category B; second class or grade; beta-粒子 lìzǐ noun particle (physics) a subatomic or elementary particle, such as an electron or photon; the fundamental constituents of matter
