其成立日，美国将美元定义为一个明确的黄金或银的重量。
In its founding days, the United States defined the dollar by an explicit weight of gold or silver.
中南大学口腔医学院成立于2002年5月23日，其前身为1986年4月建立的湖南医科大学口腔医学系。
School of stomatology Central South University, the former department of stomatology of Hunan Medical University set in April 1986, was founded in May 23, 2002.
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