I want to talk to you about four megarisks that I think will define fragility in our time, and if we can get to grips with these, I think we can do something with that lethal violence problem.
我想向大家介绍 定义现时代脆弱性的四大危机， 倘若我们能够处理这些危机， 我们就可以解决致命暴力问题。