In the first layer classification the reactions are classified in a hyperspace created based on a set of widely applicable reaction descriptors named first order reaction descriptors.

第一次分类时不同的同类反应都在由一组普适性好的称作反应结构一级描述符构成的空间中进行。

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It was in a University of Chicago squash court that Enrico Fermi set off the first controlled nuclear chain reaction in 1942.

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