World stocks held on to most of their recent gains on Wednesday and oil prices rose on news of a forthcoming meeting between top U.S. and Chinese trade officials. But the dollar was down for a fourth session and European stocks dropped as caution prevailed about prospects for any tariff deal ahead of a Federal Reserve decision on rates. U.S. Treasury Secretary Scott Bessent and chief trade negotiator Jamieson Greer will meet China's top economic official for talks that could yield the first step in resolving a trade war disrupting the global economy. "My sense is this will be about…