汇率又称外汇利率、外汇汇率或外汇行市，指的是两种货币之间兑换的比率，亦可视为一个国家的货币对另一种货币的价值。汇率是各个国家为了达到其政治目的的金融手段，汇率的变动对一国进出口贸易有着直接的调节作用。在一定条件下，通过使本国货币对外贬值，即让汇率下降，会起到促进出口、限制进口的作用；反之，本国货币对外升值，即汇率上升，则起到限制出口、促进进口的作用。
汇率通常有两种表示方法，即本币汇率和外币汇率。以单位数量的本国货币所能兑换的外币数量来表示，称为本币汇率，其公式为100￥=x外币;以单位数量的外币所能兑换的本国货币数量来表示，称为外汇汇率，其公式为100单位外币=x￥。

Exchange rate, also known as foreign exchange rate, foreign exchange rate or foreign exchange market, refers to the exchange rate between two currencies, and can also be regarded as the value of a country’s currency against another currency. The exchange rate is a financial means for each country to achieve its political goals, and the change of the exchange rate has a direct regulating effect on a country’s import and export trade. Under certain conditions, depreciating the domestic currency, that is, lowering the exchange rate, will promote exports and restrict imports; on the contrary, the external appreciation of the domestic currency, that is, an increase in the exchange rate, will play a role in restricting exports and promoting imports.
There are usually two ways to express the exchange rate, that is, the local currency exchange rate and the foreign currency exchange rate. Expressed by the amount of foreign currency that can be exchanged for a unit of domestic currency, it is called the domestic currency exchange rate, and its formula is 100￥=x foreign currency; The formula is 100 units of foreign currency = x￥.

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