TOKYO :The U.S. dollar was steady early on Thursday following its plunge to a 3-1/2-year low and then forceful rebound as traders grappled with the ramifications of the Federal Reserve's measured rhetoric on further interest rate cuts. The Fed reduced rates by a quarter point on Wednesday, as expected, and indicated it will steadily lower borrowing costs for the rest of this year, initially sending the dollar plunging. However, Fed Chair Powell characterised the day's policy action as a risk-