The NASA team is now saying they have proved that they could not have been produced by the blast itself.

美国国家航空和宇宙航行局的研究小组现在表示，他们已经证明，它们不可能是由爆炸本身产生的。

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But the Nasa team is now saying they have proved that they could not have been produced by the blast itself.

但是如今美国宇航局研究团队表示，他们已经证明这些细菌不是爆炸本身造成的。

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This is because the tremendous heat produced from a nuclear blast causes an up-draft of air that forms the familiar mushroom cloud.

这是因为核爆产生的大量的热能会把空气往上吸入，形成令人熟知的蘑菇云状。

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U.S. intelligence agencies estimated that the 2006 North Korean test produced a blast equivalent to less than 1, 000 tons of TNT, a fraction of the size of the bombs the United States dropped on Japan at the end of World War II.

CNN: N. Korea nuclear test reverberates worldwide