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Researchers mature whole design of human embryo, without having sperm or egg 无需精子和卵子 科学家培育出人类胚胎完整模型Human-manufactured objects to outweigh residing items 研究称全球人造物重量将超过所有活生物重量Biodiversity decline hazards 'ecological meltdown' – experts 生物多样性丧失可能造�