多级网络由多个单级网络互连组成。
A hierarchical network includes multiple single interconnection networks.
单级网络拓扑发现包括网络层拓扑发现和链路层拓扑发现两个方面。
Network topology discovery is composed of network layer topology discovery and link layer topology discovery.
有轨电车为单节车辆，微机网络系统采用二级控制，不必采用编组运行车辆所采用的较复杂的列车总线。
Railroad car is single section car, so microcomputer network system adopts two-stage control, does not have to adopt intricate Train-Bus that adopted by organize into groups car.
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