拓扑排序是有向图的一种重要运算。

The topological sort is an important operation of directed graphs.

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有两种方法可以向拓扑图添加新单元。

There are two ways to add a new unit to the topology diagram.

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有两种方法可以向拓扑图添加新单元。

There are two ways to add a new unit to the topology diagram.

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