Xu Guobin and his colleagues have body temperature measured before work in Xi'an, Northwest China's Shaanxi province, Feb 3, 2020. (Photos: Xinhua)

Xu Guobin (right) checks inventory in Xi'an, Northwest China's Shaanxi province, Feb 3, 2020.

Xu Guobin checks packages in Xi'an, Northwest China's Shaanxi province, Feb 3, 2020.

Xu Guobin carries his package in Xi'an, Northwest China's Shaanxi province, Feb 3, 2020.

A staff disinfects Xu Guobin's package in Xi'an, Northwest China's Shaanxi province, Feb 3, 2020.

Xu Guobin prepares for delivery in Xi'an, Northwest China's Shaanxi province, Feb 3, 2020.

Xu Guobin prepares for delivery in Xi'an, Northwest China's Shaanxi province, Feb 3, 2020.

Xu Guobin talks with recipient on the phone in Xi'an, Northwest China's Shaanxi province, Feb 3, 2020.

Xu Guobin (right) delivers a package in Xi'an, Northwest China's Shaanxi province, Feb 3, 2020.

Xu Guobin waits for his recipient in Xi'an, Northwest China's Shaanxi province, Feb 3, 2020.