pristane to phytane ratio

例句：

1. 1. The study of the pristane to phytane ratio in soil is crucial for understanding the impact of climate change on agriculture.
   研究土壤中原生烷比对理解气候变化对农业影响至关重要。
2. 2.The ratio of pristane to phytane in the oil plays a significant role in determining its quality and price.
   油中原生烷与芳烷的比率对其质量和价格有重要影响。
3. 3.The ratio of pristane to phytane in the plant's essential oils has been found to be related to its medicinal properties.
   植物精油中原生烷与芳烷的比率被发现与其药用性质有关。