现在还不清楚3号反应堆发生了什么情况，3号反应堆的燃料是混合的铀和钚。

It remains unclear what is happening with the Number-3 reactor, which is fueled by a mix of uranium and plutonium.

youdao

我们谈论的是，一个反应堆出现了破裂，在主系统的冷却系统，还有两端，闸床的破裂是什么？

So we're talking about a reactor that has a break in the primary cooling system and what is a double ended guillotine break?

youdao

首先需要说明的是，“熔化”并不是什么精确定义的专业术语，在用来衡量反应堆状况时，这个词显得相当无用。

First of all, a "meltdown" is not a precisely defined term, which makes it fairly useless as an indicator of what's going on.

youdao