alpha particle

劍橋詞典

an extremely small piece of matter with a positive electrical charge , produced when a radioactive atom is broken down, usually in a nuclear reaction
α粒子（放射性原子分裂時(shí)所產(chǎn)生的帶正電荷的微小粒子，通常在核反應(yīng)時(shí)產(chǎn)生） 返回 alpha particle