氮是生物生存所必需的重要元素，生物中的动植物只能利用化合态氮而不能利用分子态氮。
Nitrogen, the crucial element for the survival of the biology, only can be utilized by the propagation in the compound form instead of molecular form.
利用余瑞璜的“固体与分子经验电子理论”从决定合金元素行为的聚合态原子价电子结构出发，研究了奥氏体不锈钢中氮合金化的作用机制。
Based on Yu's "Empirical electron theory of solids and molecules", the mechanism of nitrogen alloying in austenitic stainless steel was investigated.
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