立方体连接环图 extended cube-connected cycle: 扩充立方体连接环connected graph: 连接图; 连通图connected directed graph: 连通的有向图; 连通方向图; 连通有向图connected undirected graph: 连通无向图edge connected graph: 边连通图下载手机词典可随时随地查词查翻译