a commodity,such as gold,or an officially issued coin or paper note that is legally established as an exchangeable equivalent of all other commodities,such as goods and services,and is used as a measure of their comparative values on the market是什么意思_a commodity,such as gold,or an officially issued coin or paper note that is legally established as an exchangeable equivalent of all other commodities,such as goods and services,and is used as a measure of their comparative values on the market在线翻译_英语_读音_用法_例句