正如本期特别报道中提到的那样，由于传感器、泛在无线网络以及精确分析软件的广泛应用，现实世界和虚拟世界正日益趋同。
As our special report in this issue explains, the physical and the virtual worlds are converging, thanks to the proliferation of sensors, ubiquitous wireless networks and clever analytics software.
分布在无线网络节点上的每一根天线都有自身信息要传送，且集合起来组成虚拟的天线阵列(VAA)。
Distributed antennas belonging to multiple users in the wireless network are collected, each with their own information to transmit, so that the users form a "virtual antenna array" (VAA).
由于无线网络存在节点失效、链路断裂等特性，虚拟主干网需要具备一定的容错性。
Because of the inherent node (link) failures in wireless networks, virtual backbones should be fault-tolerant.
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