经过一百多年的努力,一直得到保护的美国境内的国家森林在经济、环卫和社会等方面不断产生的巨大价值,正在变得越来越明显。现在回顾起来,那是在1891年美国国会推出的“森林保护法案”(ForestReserveAct)明确规定,“任何美国境内的国家森林公园,除非为了进一步改善森林的生态和 After more than 100 years of hard work, the tremendous value that the continuously protected national forests in the United States continue to produce in terms of economy, sanitation and society is becoming more and more obvious. Now, in retrospect, it was explicitly stated in the Forest Protection Act passed by the U.S. Congress in 1891 that "any national forest park in the United States unless it is necessary to further improve the ecology and