So let's be clear: currency is a kind of "medium of exchange", but there are many form of "medium of exchange", and currency is only one of them. "medium of exchange" =/= currency.
所以我们要明确一点：货币是一种“交换媒介”，但“交换媒介”有多种形式，货币只是其中一种。 “交换媒介” =/= 货币。
So let's be clear: currency is a kind of "medium of exchange", but there are many form of "medium of exchange", and currency is only one of them. "medium of exchange" =/= currency.
所以我们要明确一点：货币是一种“交换媒介”，但“交换媒介”有多种形式，货币只是其中一种。 “交换媒介” =/= 货币。