短語詞組短語backbone -network-mapping 骨乾網(wǎng)絡(luò)拓?fù)?/li>backbone network - 中樞網(wǎng)絡(luò)long - distance backbone network 長途骨乾網(wǎng)B -DCN ackbone Data Communication Network 骨乾數(shù)據(jù)通信網(wǎng)city -level backbone optical fiber network 市級(jí)骨乾光纖網(wǎng)very high -speed backbone network service 超高速骨乾網(wǎng)絡(luò)服務(wù)the first -level backbone telecommunication network 骨乾通信網(wǎng) 返回 backbone network