首先，观众必须明白门（生物学）的概念：整个动物王国分类的组织法则。

First, theaudience must understand the concept of phylum (plural, phyla): the organizingprinciple for classifying the entire animal kingdom.

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类，门：生物分类的组合，尤指属或种类，选作有其所属的更大生物分类组合的特点的典型例子。

A taxonomic group, especially a genus or species, chosen as the representative example in characterizing the larger taxonomic group to which it belongs.

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在林耐生物分类(类，属和门)系统的高等类别中进化停滞现象是相当普遍的。

Evolutionary stasis is fairly common at the higher levels of the Linnaean system of biological classification (class, order and family).

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在林耐生物分类(类，属和门)系统的高等类别中进化停滞现象是相当普遍的。

Evolutionary stasis is fairly common at the higher levels of the Linnaean system of biological classification (class, order and family).

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