Visitors try masks at the booth of the Republic of Ghana during the China-Africa Economic and Trade Expo in Changsha, central China's Hunan Province, June 28, 2019. The exhibition hall of the expo opened to public on Friday and Saturday. (Photos: Xinhua)

A boy plays at the booth of Uganda during the China-Africa Economic and Trade Expo in Changsha, central China's Hunan Province, June 28, 2019. The exhibition hall of the expo opened to public on Friday and Saturday.

A visitor takes selfies with a staff member at the booth of Uganda during the China-Africa Economic and Trade Expo in Changsha, central China's Hunan Province, June 28, 2019. The exhibition hall of the expo opened to public on Friday and Saturday.

A staff member performs hand drum to visitors at the booth of Guinea during the China-Africa Economic and Trade Expo in Changsha, central China's Hunan Province, June 28, 2019. The exhibition hall of the expo opened to public on Friday and Saturday.

A staff member from the Republic of Ghana introduces hand drum to visitors during the China-Africa Economic and Trade Expo in Changsha, central China's Hunan Province, June 28, 2019. The exhibition hall of the expo opened to public on Friday and Saturday.

A visitor takes photos of exhibits at the booth of the Republic of Mali during the China-Africa Economic and Trade Expo in Changsha, central China's Hunan Province, June 28, 2019. The exhibition hall of the expo opened to public on Friday and Saturday.