The text says that currency pairs are not always listed consistently. Instead, there are certain "traditions" about how the currency pairs are reported, such as U.S. dollars per foreign currency or foreign currency per U.S. dollar.
Go to www. bloomberg.com and under the "Market Data" pulldown click on Currencies. How are the currency pairs listed for the euro (EUR), yen (JPY), and pound (GBP) versus the dollar? What are the current exchange rates listed?