carbon isotope的用法和样例：
例句
- A more promising technique for early detection focuses on changes in carbon isotopes in carbon dioxide.
有一种较被看好的预先侦测技术，是以二氧化碳中碳同位素的变化做为分析重点。 - The cracking gas from oil is very different from the cracking gas from kerogen in components and carbon isotopes.
原油二次裂解生成的天然气与干酪根初次裂解生成的天然气在组分特征和碳同位素特征上存在明显的差异。
