A man waits for the train at a subway station in Wuhan, central China's Hubei Province, March 29, 2020. Wuhan, a central Chinese city once at the epicenter of the COVID-19 epidemic, on Saturday resumed its subway service following more than two months of suspension due to the epidemic. (Xinhua/Fei Maohua)

A man walks past painting decorations at a subway station in Wuhan, central China's Hubei Province, March 29, 2020. Wuhan, a central Chinese city once at the epicenter of the COVID-19 epidemic, on Saturday resumed its subway service following more than two months of suspension due to the epidemic. (Xinhua/Fei Maohua)

A passenger walks in a subway station in Wuhan, central China's Hubei Province, March 29, 2020. Wuhan, a central Chinese city once at the epicenter of the COVID-19 epidemic, on Saturday resumed its subway service following more than two months of suspension due to the epidemic. (Xinhua/Fei Maohua)

Photo taken on March 29, 2020 shows a vintage telephone at a subway station in Wuhan, central China's Hubei Province. Wuhan, a central Chinese city once at the epicenter of the COVID-19 epidemic, on Saturday resumed its subway service following more than two months of suspension due to the epidemic. (Xinhua/Fei Maohua)

Photo taken on March 29, 2020 shows a vintage telephone at a subway station in Wuhan, central China's Hubei Province. Wuhan, a central Chinese city once at the epicenter of the COVID-19 epidemic, on Saturday resumed its subway service following more than two months of suspension due to the epidemic. (Xinhua/Fei Maohua)

A passenger enters a subway station in Wuhan, central China's Hubei Province, March 29, 2020. Wuhan, a central Chinese city once at the epicenter of the COVID-19 epidemic, on Saturday resumed its subway service following more than two months of suspension due to the epidemic. (Xinhua/Fei Maohua)

A man asks the way at a subway station in Wuhan, central China's Hubei Province, March 29, 2020. Wuhan, a central Chinese city once at the epicenter of the COVID-19 epidemic, on Saturday resumed its subway service following more than two months of suspension due to the epidemic. (Xinhua/Fei Maohua)

A passenger takes an escalator at a subway station in Wuhan, central China's Hubei Province, March 29, 2020. Wuhan, a central Chinese city once at the epicenter of the COVID-19 epidemic, on Saturday resumed its subway service following more than two months of suspension due to the epidemic. (Xinhua/Fei Maohua)