1、Money as the actual medium of exchange is completely liquid
貨幣作為實際的交換媒介完全是可變的

2、One of the reasons for selecting gold as the medium of exchange is that it is relatively scarce.
選擇黃金作為交換媒介的原因之一是黃金的相對稀缺性。

3、the metal or paper medium of exchange that is presently used.
現(xiàn)行的金屬貨幣或紙幣。

medium of exchange翻譯