He saw major issues of gentrification and segregation in Washington beneath the surface of rapid urban renewalThese changes may look pleasant, but not qui必赢bwin全站入口te so to Derek Hyra, an associate professor at the American University School of Public Affairs and an expert on neighborhood changeThe 14th Street near U Street, a traditional African American neighborhood, is now lined up with hip restaurants and bars in this photo taken on SundayWhites are the majority now, accounting for 55 percent of the communityThe same urban renewal is happening in other parts of Washington必赢bwin全站入口China will also be contributing technical expertise and equipment in the future