邦恩说，这些反应堆的安保措施不是很让人放心。

And Bunn says these reactors aren't very well guarded.

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专家们已经意识这个事实，但领域之外的研究人员却知之甚少，邦恩说。

Specialists were aware of this fact, but very few researchers outside the field have known this, Bunn said.

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“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。

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

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