在中美关系史上,从1937年“卢沟桥事变”到1941年底太平洋战争爆发,是一非常重要的时期.这期间,美国对华政策发生了重大转变,即从本世纪初实行“门户开放、利益均沾”方针,转为援华制日政策.这种转变对战后的美中关系及世界格局产生了深远的影响. In the history of Sino-American relations, it was a very important period from the Lugouqiao Incident of 1937 to the outbreak of the Pacific War by the end of 1941. During this period, the U.S. policy on China had undergone a major change from the opening of the door to the beginning of this century All-minded "policy to the policy of assisting China, which has a profound impact on the post-war U.S.-China relations and the world pattern.