简单地说，对调查问卷的饮食记录所有变数都进入到一个统计软件包，看看他们如何成群在一起。

Simply put, all of the dietary variables recorded on the questionnaire were entered into a statistical package to see how they clumped together.

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早在公元前373年就有历史学家记录：包括蛇和老鼠在内的动物在地震来临并摧毁整座城市前成群结队地离开了希腊Helice。

In 373 BC, historians recorded that animals, including rats and snakes, left the Greek city of Helice in groups just days before a quake destroyed the city.

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