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| 能源球一个水晶球形的物体,它可以在一些特定时刻呈现出不同的颜色，显示一座楼内的能源使用状态，其设计者为奥伯林学院 (Oberlin College) 环境研究项目主任约翰・彼得森 (John Petersen) | |||
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