Won the first to use state money - is the era of the Warring States, Qin Yan and ultimately from the Qin Dynasty unified the country, won the money as a unified text vector.
在圜形方孔的钱币上注明文字，标示其价值和通行的年代区域，是历史的必然选择。
This era of peace was only a prelude to the maelstrom of the Warring States Period.
这个时代的和平只是一个序幕，相邻的战国时期。
Results: During the Warring States era, the name, etiology, pathogenesis, diagnosis and treatment of blackish facial patch had preliminary study, only formulae and drugs absence.
结果：早在春秋战国时期，对黧黑斑之病名、病因病机、诊断与治法已有初步研究，唯独方药缺如。
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