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1.Originally, a valuable metal (gold, silver or copper) served as constant store of value, and even today the American dollar is technically"backed"by the store of gold which the US government maintains.
起初人们用某种贵重金属（金、银或铜）作为有恒性的价值贮存体，甚至今天的美元从技术上说还是美国政府以其所拥有的黄金贮存量作为"后盾"的。收藏指正
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