But using commodity money means you have to make commodity money, which is solved by production technologies–like smelting.
但是使用商品货币意味着你必须制造商品货币，它是通过冶炼等生产技术来解决的。
Commodity money
原声例句
PBS趣味科普
PBS趣味科普
But commodity money has a problem: Get too much, and it's a pain to carry around.
如果它们太多了，随身携带是很痛苦的。
PBS趣味科普
But when we think of early money, we tend to think of commodity money—physical objects that are useful, like rice grains, or pretty, like gold coins.
但是当我们想到早期货币时，我们往往会想到商品货币——有用的实物，比如米粒，或者漂亮的，比如金币。
中文百科
商品货币
商品货币是法定货币以外的另一种货币类型，在政府的保证之外货币本身也有其内在的基本价值。
在近代，中央银行还没有发行法定货币的年代，大部分的国家流通的货币除了作为交易媒介以外，也有其它的用途。例如一般常见的贵金属制品，如金币、银钱，可以熔化后再制成其他的成品、也可转卖。有时尽管一国的央行已经发行了法定货币，但是由于国家发行的货币不得人心，故多数人还是改采商品货币──例如在二次世界大战后的德国，便有过以香烟取代曾经恶性通货膨胀的德国马克作为日常生活上普遍的交易媒介。
英语百科
Commodity money 商品货币
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Commodity money is money whose value comes from a commodity of which it is made. Commodity money consists of objects that have value in themselves as well as value in their use as money.
Examples of commodities that have been used as mediums of exchange include gold, silver, copper, salt, peppercorns, tea, large stones (such as Rai stones), decorated belts, shells, alcohol, cigarettes, cannabis, candy, cocoa beans, cowries and barley. These items were sometimes used in a metric of perceived value in conjunction to one another, in various commodity valuation or price system economies.
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