outer boundary英 [ˈaʊtə(r) ˈbaʊndri]美 [ˈaʊtər ˈbaʊndri]网络 外边界; 外部边界; 还可用边界线; 界线; 边界线英英释义nounthe outside boundary or surface of somethingSynonym:peripheryfringe双语例句