Aerial photo taken on Oct. 14, 2020 shows the Changsha International Conference Center under construction in Changsha, central China's Hunan Province. The construction of the Changsha International Conference Center is expected to be completed by the end of October this year. (Xinhua/Chen Zeguo)

Photo taken on Oct. 14, 2020 shows the Changsha International Conference Center under construction in Changsha, central China's Hunan Province. The construction of the Changsha International Conference Center is expected to be completed by the end of October this year. (Xinhua/Chen Zeguo)

Aerial photo taken on Oct. 14, 2020 shows the Changsha International Conference Center under construction in Changsha, central China's Hunan Province. The construction of the Changsha International Conference Center is expected to be completed by the end of October this year. (Xinhua/Chen Zeguo)

A worker does cleaning work at the Changsha International Conference Center under construction in Changsha, central China's Hunan Province, on Oct. 14, 2020. The construction of the Changsha International Conference Center is expected to be completed by the end of October this year. (Xinhua/Chen Zeguo)