Photo taken on June 26, 2019 shows fireworks marking the forthcoming China-African Economic and Trade Expo in Changsha, capital of central China's Hunan Province. The first China-African Economic and Trade Expo is to be held from June 27 to 29. (Photo: Xinhua)

Photo taken on June 26, 2019 shows fireworks marking the forthcoming China-African Economic and Trade Expo in Changsha, capital of central China's Hunan Province. The first China-African Economic and Trade Expo is to be held from June 27 to 29. (Photo: Xinhua)

Photo taken on June 26, 2019 shows fireworks marking the forthcoming China-African Economic and Trade Expo in Changsha, capital of central China's Hunan Province. The first China-African Economic and Trade Expo is to be held from June 27 to 29. (Photo: Xinhua)

Photo taken on June 26, 2019 shows fireworks marking the forthcoming China-African Economic and Trade Expo in Changsha, capital of central China's Hunan Province. The first China-African Economic and Trade Expo is to be held from June 27 to 29. (Photo: Xinhua)

Photo taken on June 26, 2019 shows fireworks marking the forthcoming China-African Economic and Trade Expo in Changsha, capital of central China's Hunan Province. The first China-African Economic and Trade Expo is to be held from June 27 to 29. (Photo: Xinhua)

Photo taken on June 26, 2019 shows fireworks marking the forthcoming China-African Economic and Trade Expo in Changsha, capital of central China's Hunan Province. The first China-African Economic and Trade Expo is to be held from June 27 to 29. (Photo: Xinhua)