最后，对于有割点的图的谱半径给出一个与子图的谱半径有关的一个不等式。
Finally, for the spectral radius of a graph with a cut vertex, we give an inequality concerning the spectral radius of the graph and its subgraphs.
一下子要把比尔的头发给割失，一下子把比尔当马骑，一下子给比尔吃沙子。
A bill to the hair to cut off, while the bill when riding horses, while eating sand to bill.
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