Employees of ZTO Express Wuhan sorting center work on packages in Wuhan, March 22, 2020. [Photo by Zhu Xingxin/chinadaily.com.cn]

Employees of ZTO Express Wuhan sorting center work on packages in Wuhan, March 22, 2020. [Photo by Zhu Xingxin/chinadaily.com.cn]

Employees of ZTO Express Wuhan sorting center work on packages in Wuhan, March 22, 2020. [Photo by Zhu Xingxin/chinadaily.com.cn]

Employees of ZTO Express Wuhan sorting center work on packages in Wuhan, March 22, 2020. [Photo by Zhu Xingxin/chinadaily.com.cn]

Employees of ZTO Express Wuhan sorting center work on packages in Wuhan, March 22, 2020. [Photo by Zhu Xingxin/chinadaily.com.cn]

Employees of ZTO Express Wuhan sorting center work on packages in Wuhan, March 22, 2020. [Photo by Zhu Xingxin/chinadaily.com.cn]

Employees of ZTO Express Wuhan sorting center work on packages in Wuhan, March 22, 2020. [Photo by Zhu Xingxin/chinadaily.com.cn]

Employees of ZTO Express Wuhan sorting center work on packages in Wuhan, March 22, 2020. [Photo by Zhu Xingxin/chinadaily.com.cn]

Employees of ZTO Express Wuhan sorting center work on packages in Wuhan, March 22, 2020. [Photo by Zhu Xingxin/chinadaily.com.cn]

ZTO freight vans are seen at the Wuhan sorting center on March 22, 2020. [Photo by Zhu Xingxin/chinadaily.com.cn]

ZTO freight vans are seen at the Wuhan sorting center on March 22, 2020. [Photo by Su Feng/chinadaily.com.cn]

Employees of ZTO Express Wuhan sorting center work on packages in Wuhan, March 22, 2020. [Photo by Su Feng/chinadaily.com.cn]

An interior view of of the ZTO Express Wuhan sorting center on March 22, 2020. [Photo by Su Feng/chinadaily.com.cn]

An interior view of of the ZTO Express Wuhan sorting center on March 22, 2020. [Photo by Su Feng/chinadaily.com.cn]

Employees of ZTO Express Wuhan sorting center work on packages in Wuhan, March 22, 2020. [Photo by Su Feng/chinadaily.com.cn]