U.S. Federal Reserve Chair Janet Yellen (C) is seen before posing for a group photo of the G20 Finance Ministers and Central Bank Governors Meeting in Washington D.C., capital of the United States, on April 21, 2017. Finance ministers from the Group of 20 leading economies have reached a broad consensus that free trade and open markets is better for promoting global economic growth, German senior officials said on Friday. (Xinhua/Yin Bogu)
