In research published Friday in The Lancet magazine, David Nutt of Bristol University and colleagues propose a framework for classifying harmful substances based on the actual risks to society.

• 在发表于星期五出版的柳叶刀杂志中的研究中，布里斯托大学的DavidNutt和同事提出了一个以对社会实际危险度为基础的有害物质分类框架。