Yang Zao, Han Chun couple from the United States was the consultant of the Ministry of Agriculture and Machinery. They committed to the rural cause of China for many years with deep feelings towards the Chinese people. On December 14, 1979, they discussed with China’s agricultural scholars on the mechanization of China’s agriculture and animal husbandry in Jinshan County and put forward pertinent opinions on the development of China's agricultural and animal husbandry industry.