Photo taken on Jan. 7, 2020 shows the elevator installation site in Zhaiji community in Yunyan District of Guiyang City, southwest China's Guizhou Province. A pilot program was launched in the district to install more elevators for old residential buildings. Lack of elevators has caused inconvenience to people who live in multi-storey buildings. (Xinhua/Yang Wenbin)

A worker measures building material for elevator installation in Zhaiji community in Yunyan District of Guiyang City, southwest China's Guizhou Province, Jan. 7, 2020. A pilot program was launched in the district to install more elevators for old residential buildings. Lack of elevators has caused inconvenience to people who live in multi-storey buildings. (Xinhua/Yang Wenbin)

A worker is busy on the elevator installation site in Zhaiji community in Yunyan District of Guiyang City, southwest China's Guizhou Province, Jan. 7, 2020. A pilot program was launched in the district to install more elevators for old residential buildings. Lack of elevators has caused inconvenience to people who live in multi-storey buildings. (Xinhua/Yang Wenbin)

Aerial photo taken on Jan. 7, 2020 shows the elevator installation site in Zhaiji community in Yunyan District of Guiyang City, southwest China's Guizhou Province. A pilot program was launched in the district to install more elevators for old residential buildings. Lack of elevators has caused inconvenience to people who live in multi-storey buildings. (Xinhua/Yang Wenbin)

A worker is busy on the elevator installation site in Zhaiji community in Yunyan District of Guiyang City, southwest China's Guizhou Province, Jan. 7, 2020. A pilot program was launched in the district to install more elevators for old residential buildings. Lack of elevators has caused inconvenience to people who live in multi-storey buildings. (Xinhua/Yang Wenbin)