为将燃料做成电能反应堆，铀被浓缩至U-235同位素含量5%以下。
To make fuel for electricity-generating reactors, uranium is enriched to less than 5 percent of the isotope U-235.
文章介绍用离子束方法分析贮氢金属中氢同位素含量与分布的实验条件与设计，并分析各自的优、缺点。
The content of deterrent and its content distribution in a new propellant were measured with gas chromatography.
大气降水的同位素含量是国家的一项基本环境数据，也是开展环境同位素科学研究和环境同位素水文地质工作必不可少的基础资料。
The precipitation isotopic content is one kind of national basic environmental data, indispensable for the environmental isotope scientific research, including environmental isotope hydrogeology.
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