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美国在全国许多自然保护区内建有许多国家公园、州立公园,供人们假日旅游,观赏森林壮丽的风景及自然奇观。早在1890年,美国一些有识之士就主张开辟国家公园和自然保护区,让人们共同享受大
The United States has built many national parks and state parks in many nature reserves throughout the country for people to travel on holidays and to see the spectacular scenery and natural wonders of the forest. As early as 1890, some people of insight in the United States advocated the opening up of national parks and nature reserves to allow people to enjoy large