神经生物学中有一个等级系统，无脊椎动物的研究不被看好，除了非常特殊的例子：枪乌贼巨大的轴突。

There was a hierarchical system in neurobiology, and working in invertebrate animals was not looked upon favorably, except in a very special case: the squid giant axon.

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该书是第一本关于神经生物学的图书，采用内容广泛，概念上，比较的方法介绍了脊椎动物和无脊椎动物所有感官系统中神经元功能的原理。

The book is the first book on the neurobiology, and takes a broad, conceptual, comparative approach, introducing the principles of vertebrate and invertebrate neural function in all sensory systems.

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脊椎动物的起源是进化生物学研究的核心问题之一，目前人们普遍认为脊椎动物与无脊椎动物中的脊索动物起源于同一个原始祖先。

The origin of vertebrates has always been a core question in evolutionary biology. It is well accepted that vertebrates and invertebrate chordate derived from a common ancestor.

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