This currency exchanges at par.

该货币按面值兑换。

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The price at which one currency exchanges for another is called a foreign exchange rate.

一个国家的货币兑换成另一个国家的货币的价格被称作外汇汇率。

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Guests can rent a car or make currency exchanges at the tour desk. Ticketing services are also provided.

客人可以在旅游咨询台安排行程或租一辆车去探索新德里。

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New York bank regulators said they are also discussing the issues with virtual currency exchanges operating in the state.

WSJ: 'Virtual' Currencies Draw State Scrutiny

Buying American stocks does not show up when calculating the trade balance, even though it does balance currency exchanges.

FORBES: The Benefits of Free Trade Agreements: The Country Always Wins

Gox, one of the largest and most widely used bitcoin to currency exchanges.

FORBES: Bitcoin Ready To Go Mainstream With First U.S. Exchange