常見例句雙語例句The valence atom of an alkali-metal atom has two states.堿金屬原子的價原子具有兩種能態(tài)。On the theoretical side, a number of calculations of cross sections, elastic as well as total, for positron-alkali-metal atom systems at intermediate energies have been carried out.在中等能量下正電子與堿金屬碰撞的彈性截面，總截面已經有理論工作計算出來了。 返回 alkali-metal atom