1 Precious metal 贵重金属 2 Sweating the money 从货币里提取贵重金属成分 3 Holey dollar 有洞的钱币，这是十九世纪在澳大利亚新南威尔士州流通的货币，因为缺乏金属材料而将钱币穿洞 4 Token 辅币，具有象征性的货币，代表的价值高于本身的价值 5 Plastic note 塑料钞票 6 Plastic card （塑料）信用卡，也叫 credit card
下面我们逐段听一遍卡鲁的这段谈话：
Money's got a very colourful history, because a number of things have been used in the place of what we use as money. Feathers, shells, cloth ...salt in Roman times when the Roman soldiers were paid in salt and that's how we get the word salary, from the Latin sal for salt.
