此方法理论上严密，解题步骤直观清晰，并对公路、水路、铁路等其它运输系统有普遍意义。

This method has a universal significance for high way, water route and other transportation systems.

youdao

此方法理论上严密，解题步骤直观清晰，并对公路、水路、铁路等其它运输系统有普遍意义。

This method has a universal significance for high way, water route and other transportation systems.

youdao