1·How was one [living in France] supposed to know whether or not to worry about a radioactive cloud?
怎能知道，[在法国生活]的人们应不应该为放射性尘埃担心呢？
2·In its early stages the rain was augmented by the small water droplets still descending from the radioactive cloud.
开始时，从放射性云下沉的小水滴使雨势增大。
3·In the early morning of April 26th 1986, an explosion at the plant released a radioactive cloud that spread over large swathes of Europe and western Russia.
1986年4月26日清晨，该电站的一次爆炸释放的辐射云蔓延至欧洲及俄罗斯西部长长的一大块地带。
4·In Oslo, callers were on the phone to the State Institute for Radiation Hygiene afternews reports told of an invisible radioactive cloud over the most denselypopulated part of Norway.
在奥斯陆（译注：挪威首都），新闻中播报了放射云正在挪威人口最稠密地区上空的消息以后，挪威辐射卫生研究所的电话被打爆了。
5·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。
6·The positrons, produced by the decay of radioactive sodium, are cooled into a similarly sized cloud of around 1m particles and held in a neighbouring trap.
由放射性钠衰变产生正电子，冷却后形成一个由大约100万个正电子组成的体积同样大小的粒子云团，这团正电子被存放在相邻的一个容器中。
7·The fireball and mushroom cloud carry radioactive particles upward, and the wind sends them near and far.
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。
8·Although such a cloud would pose virtually no threat while in the upper atmosphere, the fallout at the ground of radioactive particles from it should be a concern for any monitoring authority.
虽然这种云在高层大气中几乎不构成任何威胁，但是它在地面散发出的放射粒子的余波应该是任何监管机构所关注的。
9·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.
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。
10·There is no such thing as a radiation cloud. There can be however radioactive material. Radiation itself expands in all directions just as white light does.
根本就没有辐射云这一说。到处都可能有核物质。辐射就像光线一样四处分散。