Lu Yutong (C), chief designer of China's supercomputer Tianhe-2, displays the No. 2 certificate of the semiannual T0P500 list of supercomputers in Frankfurt, Germany, June 19, 2017. China's Sunway TaihuLight and Tianhe-2 are still the world's fastest and second fastest machines, but America's Titan was squeezed into fourth place by an upgraded Swiss system, according to the latest edition of the semiannual T0P500 list of supercomputers released Monday. (Xinhua/Luo Huanhuan)
