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The first China International Big Data Industry Expo was held in Guiyang, capital city of Southwest China's Guizhou province, in 2015. After five years of development, the expo has become one of the most influential international events staged by Guiyang. In the run-up to the 2021 Big Data Expo, to be held on May 26-29, let's take a look at a promotional video about previous expos.