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Cambridge University experts make robotic hand able to hold objects 剑桥大学科学家研发出能抓握物体的机械手Human-made objects to outweigh living factors 研究称全球人造物重量将超过所有活生物重量Professionals call for tighter limitations on 'forever chemical substances' in h2o 专家呼吁加强对英国饮用水