他与Walter Scheidel合作，Walter Scheidel是斯坦福的一个古典学者与历史学家。他们发明了一个人口增长模型，这个模型基于钱币藏匿的数据，这一工作已进行多年。

He teamed up with Walter Scheidel, a Stanford classicist and historian, to create a model of population growth and decline based on coin-hoard data gathered over the years.

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中国的钱币不仅历史悠久而且种类繁多，形成了独具一格的钱币文化。

China's coin has a long history and variety, forming a unique style of money culture.

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古钱币的价值不仅记载了中国文化的历史，也反映了中国文字的演变过程。

Calligraphy recordeds the development of Chinese history, and embodies the value of their own.

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