Chinese girls at the graduation ceremony of the Columbia University in New York, the United States, on Wednesday. Among about 15,000 graduates were nearly 600 Chinese students. According to the Open Doors Report on International Education Exchange released by the United States, the number of Chinese students enrolled by U.S. universities rose by 16.5 percent to reach nearly 275,000 from 2013 to 2014. Chinese nationals now make up 31 percent of foreign students in the United States, the most of any foreign country.Xinhua