The specter of a nuclear cloud, blowing whatever direction the wind might take it — across borders or even across oceans — suddenly seemed like a possibility.

恐怖的放射云可能被风吹向任何一个方向——跨越国界，甚至跨越大洋。一夜之间，这一切突然都成了可能。

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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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The stars form when gas in the cloud condenses under its own gravity and becomes packed enough to ignite nuclear fusion.

星云中的气体在它的重力下凝聚形成新星，新星变得足够满以避免核聚变。

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Last night, the Senate ratified the START II treaty, which, when Russia ratifies it, will enable us to make continued dramatic reductions of our nuclear arsenal and remove further the nuclear cloud from our children's future.

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In 1986, the fourth reactor at the Chernobyl nuclear complex in the Ukraine exploded and caught fire, spreading a radioactive cloud across Europe in the world's worst nuclear disaster.

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It seems reasonable that the institutes should operate and collaborate within a secure cloud, similar to the networks where we store our nuclear secrets, tax records and military intelligence.

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