西安秦岭拓展训练视频:plz translate .i appreciate

来源：百度文库 编辑：查人人中国名人网 时间：2024/05/11 15:53:52
in economics,we generally wish to determine only if a good is scarce or not ,and refrain from using the term to refer to the relative availability or abundance of a good or resource.
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