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这种兑换率的波动一直在发生，它是什么引起的呢？
Such exchange rate fluctuations happen all the time. What causes them?
youdao
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货币的兑换率始終波动。
Currency exchange rates are always subject to variation.
《牛津词典》
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货币的兑换率始終波动。
Currency exchange rates are always subject to variation.
《牛津词典》