铀有许多不同的种类，或称同位素，而在核电站中所使用的是铀235这一类，因为这些的原子最容易一分为二。
There are different kinds, or isotopes, of uranium, and the type used in nuclear power plants is called uranium-235, because these atoms are easiest to split in two.
它使用两种类型，或称同位素，的氢——氘和氚。
Two types, or isotopes, of hydrogen are used - deuterium and tritium.
同位素是同一元素的不同种类，它们有着相同的化学特性但是原子重量不同。
Isotopes are different varieties of the same element, which have identical chemical properties but differ in atomic weight.
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