In the previous example, the author information is in a lower level node.
在上面这个例子中，作者信息位于一个级别较低的节点上。
The index contains a node that is a small array of Pointers to the lower level.
索引包含一个节点，该节点是一个小型的指针数组，这些指针又指向更低的层。
In many cases of regional water resources issues, when numerical method is often adopted in groundwater flow modeling lower bed level value of aquifer on each node should be given.
对于许多区域水资源问题，用数值方法进行潜水水流模拟时，需要给出每个节点上含水层底板标高值。
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