美国是一个市场经济国家,行业竞争表现为技术较量,故形成了科技人员奋勇争先的客观环境,促进了果树技术的发展. The United States is a market economy country. The competition in the industry is characterized by technical competition. Therefore, the objective environment in which science and technology personnel courageously took the lead was formed and the development of fruit tree technology was promoted.