请帮忙翻译一下外贸报价条款英文:

请帮忙翻译一下外贸报价条款英文:
Your quoted prices shall be in US Dollars (USD).
If you request a clause to reduce the potential impact of exchange rate changes during the
Quote Validity Period, the following shall apply.
If the average exchange rate changes by more than +/- 5% during the Quote Validity
Period, the parties will meet to discuss and agree on adjustment of the pricing to reflect
such changes.
Our conditions for accepting this currency exchange rate clause are; a) you must state that
you request this clause in your quote and b) you must provide a cost-currency break down
showing percentage of cost per currency (e.g. USD: 45%, JPY: 30%, EUR: 25%).
我还是不太明白啊,为什么明明要求用美元报价.又要提供,美元,日元,欧元,所占的百分比呢?难道用三种货币报价?怎么个报法啊?