convertible currency
US /kənˌvɜːr.tə.bəl ˈkɜːr.ən.si/
UK /kənˌvɜːr.tə.bəl ˈkɜːr.ən.si/

1.
可兑换货币
a currency that can be freely exchanged for other currencies without restrictions
:
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The euro is a widely accepted convertible currency.
欧元是一种被广泛接受的可兑换货币。
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Many developing countries strive to make their currency a convertible currency.
许多发展中国家努力使其货币成为可兑换货币。