Pyongyang began destroying its main nuclear reactor and handed in its nuclear materials list last month, but there are suspicions the declaration is not accurate.

平壤上个月开始摧毁其主要的核反应堆，并交出核材料清单，不过人们怀疑公布的核材料并不准确。

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While the danger of a total meltdown at the reactor appears to be very low, radioactive materials have been detected leaking into the atmosphere along with steam from the plant.

反应堆彻底熔化的危险性看起来很低，可是放射性物质已经被探测到随发电站出来的水蒸气一同泄露到大气中。

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The neutrons are created in a fission reactor, and slowed to incredibly low speeds by materials known as moderators.

这些中子从核反应堆中产生，在减速剂的作用下减到难以置信的低速。

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In that accident, the lack of a containment vessel surrounding the reactor meant radioactive materials from the accident were spread far and wide.

WSJ: Japan to Take 40 Years to Dismantle Fukushima Nuclear Plant

Tuesday's explosion at the No. 2 reactor in the Fukushima complex, 150 miles north of Tokyo, for the first time raised the possibility that the key containment structure of the unit, which protects the reactor vessel and keeps dangerous radioactive materials from leaking out, had been damaged.

WSJ: Japan's Nuclear Crisis Escalates

The neutrons are created in a fission reactor, and slowed to incredibly low speeds by materials known as moderators.

BBC: Neutrons could test Newton's gravity and string theory