雪没有一点融化的迹象。
“气候引爆点”的一个例子就是永久冻土层的融化。
An example of a tipping point is the thawing of the permafrost.
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。
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.
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