名词
中文翻译：外汇
同义词：
['exchange rate', 'foreign currency', 'foreign money']
例句：
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1. The company needs to exchange its foreign currency for dollars.
该公司需要将其外币兑换成美元。
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2. The exchange rate of the dollar has increased significantly since last year.
自去年以来，美元的汇率显著上升。
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3. The foreign exchange market is highly volatile and can have a significant impact on global economics.
外汇市场高度波动，对全球经济有重大影响。