It is said that the nerve poison is the more primitive of the two.

据说，神经毒液在两种毒液中是较为原始的一种。

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It is said that the nerve poison is the more primitive one of the two.

据说，神经毒液是这两种毒液中较原始的一种。

youdao

It is said that the nerve poison is the more primitive of the two, that the blood poison is, so to speak, a new product from an improved formula.

据说神经毒物是原始的二，血液毒物是，亦所谓，一个新产品从一个改善的惯例。

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Ivan Kivelidi, a banker and founder of the Russian Business Roundtable, was murdered last year by poison (an obscure nerve toxin) applied to the rim of his coffee cup.

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