Xi'an and Qingdao have joined the club of cities with over 5 million permanent residents, according to the latest yearbook from the Ministry of Housing and Urban-Rural Development. (Photos: Xinhua)

A visitor experiences an industrial internet system at the 2019 International Conference on Industrial Internet in Qingdao, Shandong province, on July 25.

A visitor poses for photos at the Shenyang Palace Museum in Shenyang, capital of Northeast China's Liaoning province, March 17, 2020.

People have dinner on the terrace of a restaurant next to the Dayan Pagoda Square in Xi'an, Shaanxi province, as businesses reopen on March 23, 2020.

Employees promote online mobile phone sales via livestreaming at a shopping center in Zhengzhou, capital of Central China's Henan province, on March 20, 2020.

A teacher conducts botany lessons via livestreaming in Hangzhou, capital of Zhejiang province. (Photo: Hu Jianhuan/China Daily)

A flower garden on display in Nanjing, Jiangsu province, is designed in honor of medical workers' contributions to the battle against the novel coronavirus epidemic. (Photo: Yang Bo/China News Service)

An employee packs smartphones at a production line of Huawei in Dongguan, Guangdong province. (Photo: China Daily)

Residents enjoy hotpot at a Chengdu restaurant after it reopened recently. (Photo: China Daily)

Residents in Wuhan, Hubei province, walk down a main shopping street on March 30, 2020, as stores reopen after being shut down for more than two months due to the novel coronavirus outbreak. (Photo: Wang Jing/China Daily)

An aerial view of Wudadao district, a major tourist attraction in Tianjin. (Photo: Xinhua)

A night view of Shenzhen. (Photo: Sipa)

Flowers add color to a view of Guangzhou's central business district, on Oct 20, 2019. (Photo: Sipa)

A customer purchases a beverage in Jiangbei district of Chongqing, Southwest China, March 23, 2020. (Photo: Xinhua)

A photo shows a night view of the central business district in downtown Beijing, capital of China. (Photo: Sipa)

High-rise buildings are seen in Shanghai. (Photo: Sipa)