而楼宇自动化系统由单独的LAN 组成，通过局域操作网(Local Operation Network)专 用路由器连接到主干网上。
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In addition, reliable storage in the cloud is more expensive than local direct attached storage (DAS) or network attached storage (NAS) even when the costs of operation are considered.
FORBES: Making Connections at the 2012 CES
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