中文说明：最大流问题，用标号法寻求网络中最大流的基本思想是寻找可增广轨，使网络的流量得到增加，直到最大为止。
English Description：
For the maximum flow problem, the basic idea of finding the maximum flow in the network by labeling method is to find the augmented orbit, so that the network traffic can be increased until the maximum.