Ulf Buentgen and his team of researchers at the Swiss Federal Institute for Forest, Snow and Landscape Research collected tree-ring data from ancient wood found in medieval castles and Roman ruins.
来自瑞士联邦学院的Ulf Buentgen教授和他的研究队伍从中世纪古堡和罗马城废墟中搜寻古代的木头，企图收集关于树木年轮的信息。
According to the Independent, Swiss researchers have found that when old paper is used to make recycled cardboard, mineral oils in the printing ink may contaminate food stuffs packed inside it.
瑞士研究人员发现，用旧纸板做成的可循环利用的食品外包装，可能会污染到包装内部的食品。
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