carbon isotope composition的用法和樣例：
例句
- This paper determined the sulfu risotopic composition of the Mianning REE deposit,Sichuan Province,China.
分析了四川冕寧大型稀土礦床硫同位素組成。 - The Anqing copper deposit has a complicated sulfur isotope composition ,which can not be explained by the variations of a single sulfur source or the physico-chemical conditions.
安徽安慶銅礦床的硫同位素組成複雜，不能用單一硫源或物理化學條件的變化來解釋。
