两个地质时代岩石平均成分的差异，是化学演化真实存在的重要证据。
The difference in average composition between the rocks of two different geologic ages provides the important evidence for the actual occurrence of chemical evolution.
我们 样品的平均成分水平在某些方面与CI球粒 陨石不同：即我们发现有较多的锌、镓和铜及较少的硫。
The average composition for our sample is different in some ways from the CI chondrite meteorites: namely we found more zinc, gallium, and copper, and less sulfur.
此方法能够表征合金材料的平均成分状况，对具有不均匀成分的合金进行评估，能够更全面准确的反映粉末反应过程中的原子反应扩散程度。
The average component of the alloy can be evaluated as well as the inhomogeneity using this measure. It is indicated that the degree of the reaction diffusion among powders.
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