So long as the operands are both already sorted into document order, this avoids the need to allocate memory for the intermediate node sets.
只要已经按文档顺序排序了这两个操作数，就不必为中间节点集分配内存。
If two stores are logically related (as in our example above, where the stores were related by region), then introduce an intermediate node, but keep the stores as leaf nodes.
如果两个商店在逻辑上相关联(如上面的示例，商店通过地域相关联)，则可以引入一个中间节点，但是，要保持商店为叶节点。
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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