A merchant transfers vegetables at Qiaoxi vegetable wholesale market in Shijiazhuang, north China's Hebei Province, Jan. 9, 2021. Vegetable merchants maintained normal business at the market to ensure the supply of vegetables during the epidemic. (Xinhua/Jin Liangkuai)

Merchants transfer vegetables at Qiaoxi vegetable wholesale market in Shijiazhuang, north China's Hebei Province, Jan. 9, 2021. Vegetable merchants maintained normal business at the market to ensure the supply of vegetables during the epidemic. (Xinhua/Xing Guangli)

A merchant transfers vegetables at Qiaoxi vegetable wholesale market in Shijiazhuang, north China's Hebei Province, Jan. 9, 2021. Vegetable merchants maintained normal business at the market to ensure the supply of vegetables during the epidemic. (Xinhua/Xing Guangli)

Merchants transfer vegetables at Qiaoxi vegetable wholesale market in Shijiazhuang, north China's Hebei Province, Jan. 9, 2021. Vegetable merchants maintained normal business at the market to ensure the supply of vegetables during the epidemic. (Xinhua/Xing Guangli)

Aerial photo shows a view of Qiaoxi vegetable wholesale market in Shijiazhuang, north China's Hebei Province, Jan. 9, 2021. Vegetable merchants maintained normal business at the market to ensure the supply of vegetables during the epidemic. (Xinhua/Yang Shiyao)

Aerial photo shows a view of Qiaoxi vegetable wholesale market in Shijiazhuang, north China's Hebei Province, Jan. 9, 2021. Vegetable merchants maintained normal business at the market to ensure the supply of vegetables during the epidemic. (Xinhua/Yang Shiyao)

Aerial photo shows a view of Qiaoxi vegetable wholesale market in Shijiazhuang, north China's Hebei Province, Jan. 9, 2021. Vegetable merchants maintained normal business at the market to ensure the supply of vegetables during the epidemic. (Xinhua/Yang Shiyao)