Customized buses leave for Yuyao of Zhejiang Province at Jinyang Bus Station in Guiyang, southwest China's Guizhou Province, Feb. 24, 2020. Some 800 workers from Guizhou Province took the customized buses to Yuyao of east China's Zhejiang Province to resume work on Monday. (Xinhua/Tao Liang)

A staff member helps returning workers get registered at Jinyang Bus Station in Guiyang, southwest China's Guizhou Province, Feb. 24, 2020. Some 800 workers from Guizhou Province took the customized buses to Yuyao of east China's Zhejiang Province to resume work on Monday. (Xinhua/Tao Liang)

A returning worker places his luggage onto a customized bus at Jinyang Bus Station in Guiyang, southwest China's Guizhou Province, Feb. 24, 2020. Some 800 workers from Guizhou Province took the customized buses to Yuyao of east China's Zhejiang Province to resume work on Monday. (Xinhua/Tao Liang)

Returning workers board a customized bus at Jinyang Bus Station in Guiyang, southwest China's Guizhou Province, Feb. 24, 2020. Some 800 workers from Guizhou Province took the customized buses to Yuyao of east China's Zhejiang Province to resume work on Monday. (Xinhua/Tao Liang)

A staff member helps returning workers get registered at Jinyang Bus Station in Guiyang, southwest China's Guizhou Province, Feb. 24, 2020. Some 800 workers from Guizhou Province took the customized buses to Yuyao of east China's Zhejiang Province to resume work on Monday. (Xinhua/Tao Liang)

Customized buses prepare to leave for Yuyao of Zhejiang Province at Jinyang Bus Station in Guiyang, southwest China's Guizhou Province, Feb. 24, 2020. Some 800 workers from Guizhou Province took the customized buses to Yuyao of east China's Zhejiang Province to resume work on Monday. (Xinhua/Tao Liang)