Staff members paste QR codes on imported cold chain food for traceable management at a regional cold chain center in Wuhan, capital of central China's Hubei Province, Jan. 7, 2021.Photo:Xinhua

A staff member sprays disinfectant on the package of imported cold chain food at a regional cold chain center in Wuhan, capital of central China's Hubei Province, Jan. 7, 2021.Photo:Xinhua

Aerial photo taken on Jan. 7, 2021 shows imported cold chain food discharged at a regional cold chain center in Wuhan, capital of central China's Hubei Province.Photo:Xinhua

A staff member sprays disinfectant at a regional cold chain center in Wuhan, capital of central China's Hubei Province, Jan. 7, 2021.Photo:Xinhua

A staff member sprays disinfectant on the package of imported cold chain food at a regional cold chain center in Wuhan, capital of central China's Hubei Province, Jan. 7, 2021.Photo:Xinhua

A staff member seals imported cold chain food after disinfection at a regional cold chain center in Wuhan, capital of central China's Hubei Province, Jan. 7, 2021.Photo:Xinhua