Pressure exchanging rate 压力转换比
air exchanging rate 换气速度
energy exchanging rate 能量交换率
同义词： rate of exchange
以上来源于: WordNet
This promise can be verified every minute of the day by observing the current rate of exchange between the dollar and gold, and, under a classical gold standard, by exchanging currency at a national bank for gold coins of a fixed weight and purity.
FORBES: The Dollar, Gold And The Quality Of Money
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