收集种子,收集希望(2)
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价格的定义
价格的定义The Definition of "Price" Prices determine how resources are to be used. They are also the means by which products and services that are in limited supply are rationed ...
美文:星星是怎么样的?
星星What Are Stars Like? Have you ever wondered about the stars? In some ways stars are like people. They are born. They grow old. And they die. A star is born from dust and gas. Slowly th...
青年在网络社区的危险行为 (2)
提示:Richard Blumenthal,Roy Cooper,Noelle TalleyIn the United States, about half of all young people use social networking sites like MySpace and Facebook. Doctor Dimitri Christakis at Seattle...
高清晰电视(2)
竞争常意味着等待人们做出选择。比如VCR-卡带式录像机的例子...Two major Hollywood studios, Paramount Pictures and Universal Pictures, have agreed to release movie only in HD DVD. The Toshiba company...