It is significant that we did not learn the degree of melting until several years later, when the reactor vessel’s radioactivity had decayed sufficiently to open it.
我们是在事故发生数年之后才了解到当时核燃料融化的情况，因为那个时候反应炉的辐射才衰变至足以安全开炉的程度，这一点很重要。
Ok, select one of the box and then go to the Reactor panel click on Open Property Editor.
好，选择其中一个方体和到反应堆面板点击打开特征编辑器。
Ok, select one of the box and then go to the Reactor panel click on Open Property Editor.
好，选择其中一个方体和到反应堆面板点击打开特征编辑器。
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