Farmers take care of the strawberry seedlings in greenhouse at Qugou Township of Gu'an County, north China's Hebei Province, Nov. 17, 2018. (Xinhua/Men Congshuo)

　　A farmer harvests mushroom in greenhouse at Wanggezhuang Village of Zunhua City, north China's Hebei Province, Nov. 17, 2018. (Xinhua/Liu Mancang)

　　Aerial photo taken on Nov. 17, 2018 shows farmers working at Lushan tea garden in Weining Yi Hui and Miao Autonomous County, southwest China's Guizhou Province. (Xinhua/Wang Chunliang)

　　A working staff takes care of vegetables in greenhouse in Shijiazhuang, capital of north China's Hebei Province, Nov. 16, 2018. (Xinhua/Chen Qibao)

　　Farmers work in greenhouse at an agricultural sightseeing garden in Renhuai City, southwest China's Guizhou Province, Nov. 17, 2018. (Xinhua/Chen Yong)