paper money

名词 paper money:

1. currency issued by a government or central bank and consisting of printed paper that can circulate as a substitute for specie
   同义词：folding money, paper currency

1. Because large sum of metal money is heaved and inconvenient to handle, government issue paper money.
   因为大量金属货币使用起来笨重不方便，政府便发行了纸币。