Two types, or isotopes, of hydrogen are used - deuterium and tritium.

它使用两种类型，或称同位素，的氢——氘和氚。

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The best fuels for fusion are two types, or isotopes, of hydrogen - deuterium and tritium.

最好的核聚变材料有两种，即氢的同位素——氘和氚。

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Radionuclides or isotopes for medical or industrial purposes, such as Cobalt 60, Caesium 131 and lodine 132.

放射性核素或核素用于医疗或工业目的，例如：钴60、铯131和碘132。

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The researchers looked at the different types, or isotopes, of oxygen atoms trapped in the samples and, using a well-established technique, were able to infer water temperatures at the time the organisms built their shelly parts.

BBC: Dinosaurs felt the heat

To find out how warm the earth was before that, climatologists have had to resort to indirect methods, such as measuring tree-rings, or counting the different isotopes of oxygen in layers of polar ice.

ECONOMIST: The hole story of global warming

Thus, it reasonably bars the export of HEU for use as reactor fuel or as targets to produce medical isotopes except on an interim basis to recipients who provide assurances that an alternative nuclear fuel or target will be used in their facilities whenever possible.

CENTERFORSECURITYPOLICY: Kyl and Schumer move to monitor uranium exports