sterane

例句：

1. 1.The sterane molecules are responsible for the unique properties of this material.
   石烷分子负责这种材料的独特性质。
2. 2. The study of steranes has led to a better understanding of the Earth's climate system.
   对石烷的研究有助于更好地理解地球的气候系统。
3. 3. The steranes found in certain types of rocks can be used as indicators of ancient environmental conditions.
   某些类型岩石中发现的石烷可以作为古代环境条件的指标。