利用系统发育基因组学方法解析固氮分支等关键类群的系统发育关系，探讨结瘤固氮等关键性状形成和创新机制。

    Utilizing phylogenomic methods to resolve the phylogenetic relationships of key clades, such as the nitrogen-fixing clade, and to investigate the formation and innovation mechanisms of key traits, such as nodulation and nitrogen fixation.