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A farmer picks tomatoes at an organic vegetable greenhouse in Ceyu Town, Jingxing County, Shijiazhuang City, north China's Hebei Province, Feb. 28, 2019. (Xinhua/Wang Baolong)

A farmer picks tomatoes at an organic vegetable greenhouse in Ceyu Town, Jingxing County, Shijiazhuang City, north China's Hebei Province, Feb. 28, 2019. (Xinhua/Wang Baolong)