An employee works in a dairy enterprise in Xi'an, northwest China's Shaanxi Province, Feb. 26, 2020. Dairy enterprises in Xi'an took measures to ensure the supply amid novel coronavirus control and prevention efforts. (Xinhua/Liu Xiao)

A worker works in a dairy enterprise in Xi'an, northwest China's Shaanxi Province, Feb. 26, 2020. Dairy enterprises in Xi'an took measures to ensure the supply amid novel coronavirus control and prevention efforts. (Xinhua/Liu Xiao)

An employee works in a dairy enterprise in Xi'an, northwest China's Shaanxi Province, Feb. 26, 2020. Dairy enterprises in Xi'an took measures to ensure the supply amid novel coronavirus control and prevention efforts. (Xinhua/Liu Xiao)

A lorry waits for fresh milk in a dairy enterprise in Xi'an, northwest China's Shaanxi Province, Feb. 26, 2020. Dairy enterprises in Xi'an took measures to ensure the supply amid novel coronavirus control and prevention efforts. (Xinhua/Liu Xiao)

Workers work in a dairy enterprise in Xi'an, northwest China's Shaanxi Province, Feb. 26, 2020. Dairy enterprises in Xi'an took measures to ensure the supply amid novel coronavirus control and prevention efforts. (Xinhua/Liu Xiao)