曼彻斯特大学公布了戴维的一段话：“自然环境中没有致癌物。”
A quote from David put out by the University of Manchester saying "there is nothing in the natural environment that can cause cancer."
曼彻斯特大学公布了戴维的一段话：“自然环境中没有致癌物。”
A quote from David put out by the University of Manchester saying "there is nothing in the natural environment that can cause cancer."
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