In the core, uranium atoms are bombarded with free neutrons producing immense heat.

在核反应堆芯，自由中子连续撞击轴原子，从而产生大量热量。

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The uranium or plutonium isotopes are referred to as "fissile," which means we can use them to induce fission by bombarding them with free neutrons.

铀或钚的同位素被称为裂变材料，即我们可以利用自由中子去轰击它们来产生裂变反应。

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"The uranium or plutonium isotopes are referred to as" fissile, "which means we can use them to induce fission by bombarding them with free neutrons."

铀或钚的同位素被称为裂变材料，即我们可以利用自由中子去轰击它们来产生裂变反应。

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The change is being caused by the expiration of the HEU-LEU contract, signed in 1993 by Russia and the US. The treaty, which expires in 2013, allowed the duty-free export of Soviet uranium extracted from nuclear warheads.

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The United Arab Emirates, they actually signed a free trade deal to import uranium from Australia.

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