Photo taken on July 26, 2018 shows the prototype of China's new-generation exascale supercomputer Tianhe-3 at the National Supercomputer Center in Tianjin, north China. The research and development of the prototype of China's new-generation exascale supercomputer Tianhe-3 is complete, the National Supercomputer Center in Tianjin announced Thursday. The final version of Tianhe-3 will be operational by 2020. (Xinhua/Mao Zhenhua)