They are the price of one currency in terms of another and, like the price of anything, when exchange rates change, supply and demand changes.

他们像任何东西的价格一样，是一种货币对另一种货币的价格，汇率变化时，供给和需求也会产生变化。

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Professor: It is the price of one currency expressed in terms of another .

汇率是指一种货币用另一种货币来表示的对值。

youdao

Al-Fusail says the price-hikes are a result of the devaluation of the local currency.

VOA: standard.2010.04.20

But if the price of avoiding currency wars is even looser monetary policy, this brings risks of a different kind.

WSJ: There's a Feeling of Instability Bubbling Up

Hedging allows companies to fix the price of a currency months in advance.

BBC: Launching new models ate into BMW's finances

So far Germans have grudgingly paid the bills she has presented as the price of saving the currency.

ECONOMIST: German politics