Nuclear experts say that radiation from the core of a reactor can split water molecules in two, releasing hydrogen.

原子能专家说，核反应堆堆芯的放射线能够把水分子一分为二从而产生氢气。

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The active core of a nuclear reactor splits atoms in two to produce bursts of energy and, as a byproduct, large masses of highly radioactive particles.

核反应堆的活动区将原子一分为二，从中产生大量的能量，同时作为副产品，会产生大量的发射性很高的物质。

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There, half the reactor core melted in the first two hours of the accident. The melting stopped when an operator turned on emergency cooling, which had mistakenly been turned off.

在那次事故中，有一半核反应堆芯在事故发生后的两小时内便融化了，直到工作人员将误关的应急冷却系统开关重新打开，反应堆芯才停止了融化。

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