这项研究恰好回应了《哈佛商业评论》2005年第九期的一篇文章。
The study's findings echo an article published in the September 2005 issue of Harvard Business Review.
第四阶段，燕文化的持续扩张，包括燕文化的第九期，年代相当于战国晚期。
The fourth stage, Yan culture decline phase, including the Ninth Yan culture, age is equivalent to the late Warring States period.
人们通常从冬至开始计算“九个寒冷期”。
People often start counting "nine cold periods" starting from winter solstice.
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