我们涵盖所有的公共交通工具：地铁，公共汽车，轻轨，区域和郊区铁路和水路运输。
We cover all modes of public transport: metro, bus, light rail, regional and suburban rail, and waterborne transport.
路线和时间计划是为公路运输特定设置的，因为铁路和水路运输已经有严格的路线和时间表了。
The routing and scheduling is specific is for motor only because railway and water have strict routes and schedules.
公路、铁路和水路运输总有到不了的地方，就算能到，也需要把许多又大又重的货物拆成零件来运送，然后再在目的地重新组装。
Roads, rivers and railways do not reach everywhere, and even if they did, many cumbersome and heavy objects would need to be hauled in pieces, only to be put together at the final destination.
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