natural isotopic composition 天然同位素组成
initial isotopic composition 原始同位素组成
nd isotopic composition nd同位素组成 ; nd同位素
Pb isotopic composition 铅同位素组成
non-natrual isotopic composition 非天然同位素成分
carbon isotopic composition 碳稳定同位素成分
non-natural isotopic composition 非天然同位素成分
By analysing the isotopic composition of hydrocarbon molecules from plant waxes of the period.
通过分析该时期植物腊的碳氢分子同位素组成。
The trick they used to do this was to look at the isotopic composition of the oxygen in the wood of local trees.
他们所使用的办法是观测当地树木的木材中的氧同位素组成（isotopic composition）。
The influence of the monsoon climate on the isotopic composition of precipitation is discussed based on the accumulated data in China.
根据我国积累的雨水同位素组成资料，讨论了季风气候对雨水同位素组成的影响。
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