Then, how can we know that sunspots are stable nuclear fusion reactors?

那么，我们怎么知道太阳黑子是稳定的核聚变反应堆呢？

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Another method of communication could be through the use of incredibly powerful pulsed lasers, such as those now being developed for nuclear fusion reactors.

另一种通讯方法可能是使用诸如现在为核聚变反应堆开发的那些非常强大的脉冲激光器。

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For the long term the plan lists nuclear fusion, solar electric energy and the study of breeder reactors as priorities.

从长远来看，该计划把核聚变、太阳能发电和增殖反应堆列在优先地位。

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Tri-Alpha wants to bring nuclear fusion reactors to market, according to sources.

FORBES: Hollywood, Silicon Valley and Russia Join Forces on Nuclear Fusion

But the Moon is a source of rare earth elements, as well as Helium-3, a possible future fuel for nuclear fusion reactors (if we ever actually invent them).

FORBES: Richard Branson Wants a Population on Mars. Here's How He Can Create It.

Mining the moon for fuel used in nuclear fusion reactors is among NASA's 200-plus set of mission goals and could precipitate another reason for other countries and private investors to join future lunar exploration.

CNN: Mining the moon for a nuclear future