开始时，从放射性云下沉的小水滴使雨势增大。
In its early stages the rain was augmented by the small water droplets still descending from the radioactive cloud.
火球和蘑菇云将放射性粒子推到上空，然后风将它们吹送到附近及远处。
The fireball and mushroom cloud carry radioactive particles upward, and the wind sends them near and far.
对于冷战期间诙谐幽默的人来说更愿意选择地面零点：他们冷嘲到，在第一个蘑菇云出现时就被烧死总比过后意识到全世界到处都有放射性物质要好。
To wags during the cold war, ground zero was a favoured spot: better to be incinerated in the first mushroom cloud, they joshed, than to wake up to a world of radioactive rubble.
一些云分析师正在考虑使用事实情况：不同于放射性尘埃，火山灰可在远处被观测到，从而做出更好的结论。
Some cloud modellers are considering using the fact that ash, unlike fallout, can be seen from afar to make better calculations.
它整整燃烧了10天，产生的放射性物质云笼罩了前苏联的大片地区。
It burned for 10 days and released a cloud of radioactive matter that spread over a wide area of the USSR.
它整整燃烧了10天，产生的放射性物质云笼罩了前苏联的大片地区。
It burned for 10 days and released a cloud of radioactive matter that spread over a wide area of the USSR.
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