invalid currency

• 失效通货

invalid currency的用法和样例：

例句

1. The official currency issued by a government or national bank.
   由国家银行或政府发行的官方通货。
2. The term depreciation describes a decline in the value of one currency in terms of another.
   降值是用来说明某种通货以另外一种通货标价的价值降低的情况。