Liǎng zhǒng huòbì de bǐjià měitiān dōu zài biànhuà.
The exchange rate between the two currencies changes daily.
Tips
usage
比价 works both as verb ('compare prices') and noun ('price ratio / parity'). In finance news it often refers to commodity price ratios, e.g. 金银比价 (gold-to-silver ratio).
