为了为美国游憩与公园协会准备一篇报告，来自美国宾州州立大学的研究员处理了来自各种研究的数据。
Researchers at Penn State crunched the Numbers from a variety of studies, for a report they prepared for the National Recreation and Park Association.
为了为美国游憩与公园协会准备一篇报告，来自美国宾州州立大学的研究员处理了来自各种研究的数据。
Researchers at Penn State crunched the Numbers from a variety of studies, for a report they prepared for the National Recreation and Park Association.
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