Theta theory is about the relation between Argument and Thematic roles. 题元理论是关于论元与题元角色分配的理论。
As a case study of Poyang Lake, the divergent process of the indicator system formation has been made to establish the initial indicator set by using the matter-element theory. 并以鄱阳湖为例，运用物元理论进行指标体系生成的发散过程，形成了初始指标集。
