Earth's internal heat, fueled by radioactivity, provides the energy for plate tectonics and continental drift, mountain building, and earthquakes.

地球内部因放射而产生的热量为板块运动、大陆漂移、造山运动和地震提供了能量。

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Fourth generation reactors have better ways of dealing with "afterheat, " heat created by leftover radioactivity in a reactor, and could circumvent the problem completely.

第四代核反应堆采用更为先进的方法处理“残热”，且能彻底绕开此问题。 残热产生自反应堆中残余的放射能。

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Fortunately, the radioactivity of spent fuel—and therefore its ability to generate heat—drops fairly rapidly in the first few days and weeks after it is removed from the core.

所幸，乏燃料棒的辐射量及其产热量在开始几天和移出反应核之后的几周里都在不断下降。

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