最近，美国在宾夕法尼亚州新开辟了一个“知识公园”。设计者利用山地茂密的森林和曲折起伏的地形，布置了许许多多普及自然常识的“知识是点”。如一个树柱旁边立着一块问题牌，上面写着：你能回答大树的年龄吗？你知道这是～株什么树吗？从这个村住你能判断出东南西北的方向 Recently, the United States opened a new “knowledge park” in Pennsylvania. Designers use the densely forested forests and winding terrains to lay out many “points of knowledge” that popularize common sense of nature. As a tree standing next to a question card, which read: Can you answer the age of the tree? Do you know what this is? Live from this village you can judge the direction of southeast northwest