Another was to use foreign currency: the bank could lend, or accept a bill of exchange, in one currency and collect its debt in another, building a hidden rate of interest into the exchange rate.

另一个好处是他们可以利用外国货币。银行可以用一种货币借出汇票再用另一种货币来收债，暗中调高的汇率就成了银行自己的潜利润。

youdao

The exchange rate also known as the exchange rate, exchange rates or foreign exchange going-rate, that is, the price of foreign exchange trading.

汇率又称汇价、外汇牌价或外汇行市，即外汇的买卖价格。

youdao

Under a currency board arrangement, the central bank guarantees the redemption of all notes in circulation at a set exchange rate to the dollar or another foreign currency or basket of currencies.

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Holders of precious metals or other major tradable (fungible) assets worldwide need to monitor the foreign exchange rate of the currency in which their asset is held.

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And in some cases a bank decides on its own to hold on to a transfer in the hope of getting a better foreign-exchange rate for the customer the following day, or in order to batch it with other transfers and so lower its costs.

ECONOMIST: Banking