Within the measurement infrastructure, counters are structured using a two-level hierarchy.

在测量基础架构中，用两级层次对计数器进行结构化。

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The Internet is a three level hierarchy composed of backbone networks, mid-level networks, and stub networks.

因特网由三个层次组成：骨干网，中间层次网和子网络。

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Searching variables in two level hierarchy, it is possible to avoid the appearance of unfeasible results. So the search space is greatly reduced and efficiency is improved.

通过将需寻优的变量放在内外两个层次进行遗传搜索，可避免无理解的产生，使搜索空间大大缩小，提高了搜索效率。

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Life is organised into a hierarchy, and selection can and does act at every level of that hierarchy.

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More damning: the younger, less experienced and at a lower level in the hierarchy you are the worse it is.

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Therefore, resources tend to be managed at the executive level, often through a sophisticated hierarchy and a well-developed information system.

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