Workers are on duty at a petroleum equipment company in Yantai, east China's Shandong Province, Feb. 11, 2019, the first workday after Spring Festival holiday. Millions of Chinese return to work as the week-long Spring Festival holiday ends. (Xinhua/Tang Ke)

Gong Fuqiang, a crane driver, conducts security check for container loading at Zhenghe Xinggang Terminals of Taicang Port in Suzhou, east China's Jiangsu Province, Feb. 11, 2019, the first workday after Spring Festival holiday. (Xinhua/Ji Haixin)

Gong Fuqiang, a crane driver, works at the operator's cab at Zhenghe Xinggang Terminals of Taicang Port in Suzhou, east China's Jiangsu Province, Feb. 11, 2019, the first workday after Spring Festival holiday. (Xinhua/Ji Haixin)

Gong Fuqiang, a crane driver, looks out of the door of a rest room at Zhenghe Xinggang Terminals of Taicang Port in Suzhou, east China's Jiangsu Province, Feb. 11, 2019, the first workday after Spring Festival holiday. (Xinhua/Ji Haixin)

The photo shows the process of container loading by a crane driver at Zhenghe Xinggang Terminals of Taicang Port in Suzhou, east China's Jiangsu Province, Feb. 11, 2019, the first workday after Spring Festival holiday. (Xinhua/Ji Haixin)

Workers of a manufacturing plant are on duty at an industrial park in Xiajiang County, east China's Jiangxi Province, Feb. 11, 2019, the first workday after Spring Festival holiday. Millions of Chinese return to work as the week-long Spring Festival holiday ends. (Xinhua/Chen Fuping)

Workers are on duty at a petroleum equipment company in Yantai, east China's Shandong Province, Feb. 11, 2019, the first workday after Spring Festival holiday. Millions of Chinese return to work as the week-long Spring Festival holiday ends. (Xinhua/Tang Ke)

A worker is on duty in Changzhou City, east China's Jiangsu Province, Feb. 11, 2019, the first workday after Spring Festival holiday. Millions of Chinese return to work as the week-long Spring Festival holiday ends. (Xinhua/Chen Wei)

Workers are on duty at a fruit company at Nanfeng County of Fuzhou City, east China's Jiangxi Province, Feb. 11, 2019, the first workday after Spring Festival holiday. Millions of Chinese return to work as the week-long Spring Festival holiday ends. (Xinhua/Yuan Zhi)

A worker is on duty at a machinery company in Hongze District of Huai'an City, east China's Jiangsu Province, Feb. 11, 2019, the first workday after Spring Festival holiday. Millions of Chinese return to work as the week-long Spring Festival holiday ends. (Xinhua/Wan Zhen)

A worker is on duty at a company in Taizhou City, east China's Jiangsu Province, Feb. 11, 2019, the first workday after Spring Festival holiday. Millions of Chinese return to work as the week-long Spring Festival holiday ends. (Xinhua/Yang Yugang)