"One of the biggest and most difficult stumbling blocks at this point is Russia, frankly," says Harvard's Matthew Bunn.

“坦率地说，在这一点上，最大和最困难的障碍之一就是俄罗斯，”哈佛的马修·邦恩说。

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In 2006, his colleague Matthew Bunn created a mathematical model predicting a 29 percent probability of a nuclear attack in the next 10 years.

2006年，他的同事马修·邦恩创建了一个数学模型，以此预测出未来10年核攻击概率为29%。

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