对贝壳的同位素分析使得地质学家可以测量另一种冰川效应。
Isotopic analysis of shells allowed geologists to measure another glacial effect.
通过分析其中的同位素(同一种元素拥有不同的质量)比例，他可以了解这些菊石所生活的环境特征，如温度和盐度。
By analyzing ratios of isotopes — variations of the same element with a different mass - he can learn things about the environment they lived in, such as temperature and salinity.
碳的同位素分析与其他的研究结果告诉我们，大气中的二氧化碳大部分来源于工业生产的排放。
Analysis of carbon isotopes, among other things, shows that the carbon dioxide from industry accounts for most of the build-up in the atmosphere.
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