Why do Swedish table tennis players use hexagonal rackets? What are the advantages?
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Column design: 91 Author of this issue: Wang Yongjian, Associate Professor of Nanjing Agricultural University, Deputy Secretary-General of the Science Popularization Committee of Jiangsu Mechanics Society This issue is planned by: Little Dandelion, 91 Source of the picture: Xinhua News Agency |
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![The efficacy and function of Sophora flavescens[Picture]](/upload/images/67ca085e5ce02.webp)
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