The risk of a reactor meltdown there is awful enough .
日本核反应堆熔毁的风险已经够可怕的了。
During that period it became clear that a partial meltdown had taken place in at least one of the six reactors .
在此期间，很明显，6个反应堆中至少有一个会部分溶解。
A catastrophic meltdown is a sombre possibility .
灾难性的反应堆熔毁是一个令人沮丧的可能性。
The united states hasn 't had a meltdown since at any of its more than 100 reactors .
自那以来，美国本土上的100多座反应堆没有出现过熔毁事故。
If the cores cannot be cooled sufficiently , a total meltdown could ensue , exposing the fuel rods to the outside air and further spreading radiation .
