In October 1970, over 1000 cultural relics were unearthed from a hoard of the Tang Dynasty at Hejiacun in Xi'an, Shaanxi;among these cultural relics, there were many rare medicine materials and medical tools, which provided treasurable physical materials for the researches on the histories of the Chinese traditional medicine and the alchemy of the Taoism, and showed us an aspect of the development of the external alchemy of the Taoism in the Tang Dynasty.%1970年10月,陕西省西安市何家村窖藏出土了1000余件唐代文物,其中有多种贵重药物和医药器具,这类文物为研究中国古代医药史、道教炼丹史等提供了珍贵的实物资料,从中也可以看出唐代道教外丹术发展的一个侧面。
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