Make sure you're in intermediate or advanced mode, then click on a start node.
请确保处于中级模式或高级模式，然后单击某个开始节点。
In transportation networks, a transshipment node with flow demands fails to conform to flow conservation, and can not be categorized to a source, a sink or an intermediate node.
运输网络中有流量需求的转运结点不遵从流量守恒条件，也不能按源、汇及中间结点归类。
In transportation networks, a transshipment node with flow demands fails to conform to flow conservation, and can not be categorized to a source, a sink or an intermediate node.
运输网络中有流量需求的转运结点不遵从流量守恒条件，也不能按源、汇及中间结点归类。
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