fiat money

例句：

1. 1.The government has introduced a new fiat currency to replace the old one.
   政府已经引入了一种新的法定货币来取代旧的货币。
2. 2. Fiat money is often used as a medium of exchange in international trade.
   法定货币通常在国际贸易中用作交换媒介。
3. 3.Many people use fiat money for their daily expenses because it is widely accepted and easily accessible.
   许多人使用法定货币作为他们的日常开支，因为它被广泛接受且易于获取。