東京奧運：令人	
東京奧運：令人驚訝的東京奧運獎牌來源 - BBC News 中文
借助「城市採礦」的方法，日本從廢棄的電子垃圾中回收貴金屬製造奧運獎牌，但一勞永逸的方法是停止購買設備，只購買服務。
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