潜在问题的程度正越来越清晰：31个国家已经在运转大型核能反应堆，其中一些国家将继续增加。

The scale of the potential problem is getting clearer: 31 countries already operate large nuclear-power reactors, and some of those will be adding more.

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科学家一直在寻找更简单的方法制造名为浓缩铀的昂贵材料- - - - - -核反应堆和炸弹的燃料，现在只在大型工厂生产。

Scientists have long sought easier ways to make the costly material known as enriched uranium - the fuel of nuclear reactors and bombs, now produced only in giant industrial plants.

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但是核武化的纯核聚变反应堆将配备小型激光器和目前被用于建设大型设备的其他触发技术。

But weaponized pure fusion would require miniaturizing lasers or other trigger technologies that currently involve building-sized equipment.

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