Then transit network is formed according to land use, transit stations and hubs, and passenger flow assignment on the layer of transit network is realized.
进而结合用地性质和公交场站形成公交线网，再实现公交线网层上的公交客流分配。
Layer 3 switch not only implements high-speed data transit, but also accomplishes routing among VLANs.
三层交换机既实现数据的高速交换，又完成VLAN之间的路由。
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