N currency serving as a medium of exchange 通货 [finance]
Money is our circulating medium in trade.
金钱是商贸流通的媒介。
The use of air as a circulating medium for drilling is the best way for the development of low pressure and low permeable formation.
空气钻井采用空气作为循环介质，最适低压和低渗透储层的开采。
Money is always circulating from one pocket to another. Without the commodity transfer to meet folks' needs, the existence of money as a medium is unnecessary.
金钱是流通物，从这个口袋流到那个口袋，如果没有满足人们真实需要的商品的迁移，钞票这种信物就没必要存在。
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