乙种射线 yǐzhǒngshèxiàn beta ray Definitions Defs Origin Strokes Stroke Words Sentences Sents 乙种 乙種 yǐzhǒng category B type B; category B; second class or grade; beta-射线 射線 shèxiàn noun ray (physics) A stream of high-energy particles or electromagnetic waves, such as X-rays or alpha rays.
