Wǒ xiǎng zhīdào měiyuán duì rénmínbì de shíshí huìlǜ.
I want to know the real-time USD/CNY rate.
Tips
usage
Financial-news phrasing — 美元兑人民币 quotes how many RMB one USD buys (e.g. 7.2), the opposite direction from 人民币兑美元. The 兑 (duì, 'convert to/against') construction is specific to currency.