在某些情况下，可能需要构建层次化知识库(hierarchical knowledge base)，这种结构将节点放在层次结构的多个级别上。
In some cases, you may want to build a hierarchical knowledge base, consisting of nodes at multiple levels in the hierarchy.
当你们被告知在你们内拥有全部的知识的时候，是因为在一个更高的层次，你们是你们学过的每件事情的的总和。
When you are told that you have all knowledge within, it is because on a higher level you are the sum total of everything you have learnt.
在Web设计、操作及它对社会的影响力方面我们仍然只知道一些浅层次的知识，缺乏对它的深入科学研究和了解。
We have only scratched the surface of what could be realized with deeper scientific investigation into its design, operation and impact on society.
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