Cows eat grass at a dairy farm run by Kelly D. Cunningham in rural Cass County of the U.S. state of Iowa, Oct. 16, 2019. (Photos: Xinhua)

Agricultural machinery works in a field of Grant Kimberley's family farm in Maxwell, the U.S. state of Iowa, Oct. 17, 2019.

Workers process almond at a processing plant of Travaille and Phippen, an almond growing and processing enterprise, in Modesto, the United States, on April 25, 2018.