The monetary system of some countries used to be based on gold. 过去有些国家的货币制度是金本位制的。
While I generally understand the way foreign exchange markets work, I am not sure exactly what the International Monetary System is. 虽然我对于外汇市场的机制有了大概的了解,但是对于什么是国际货币制度这个问题还是不十分清楚。