How much is $1 U.S. dollar worth in China?

Excuse me, could you please elaborate on the value of one U.S. dollar in China? I understand that exchange rates can fluctuate, but I'm curious about the general conversion rate between the two currencies. Is there a standard or average exchange rate that's commonly used for reference? Additionally, how does one typically go about converting their U.S. dollars to Chinese currency when traveling or making transactions in China?