Dr Bayliss's work suggests they were the product of two booms, each just a few decades long—for the Neolithic seems to have seen its share of busts, too.

Bayliss博士的考古研究表明它们是两个繁荣期的产物，每个繁荣期的持续时间仅为几十年，可见新时器时代似乎也存在过衰落的萧条期。