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NO.1
A: I 'd like to exchange some U.S. dollars. What's today's exchange rate?
B: It 's 6.9 Yuan to 1 U.S. dollar today.
A: 我想兑换一些美金，今天的汇率是多少？
B: 今天的汇率是6.9元人民币兑换1美金。
exchange [ɪksˈtʃeɪndʒ] 兑换，交换
NO.2
What kind of currency do you want to exchange?
你想兑换哪一种货币？
currency [ˈkʌrənsi] n.货币
NO.3
Please exchange this RMB into dollars.
请把这些人民币兑换成美金。