eicosane

例句：

1. 1.The chemical was used as a solvent for the reaction.
   这种化学物质被用作反应的溶剂。
2. 2.The oil is extracted from the plant and used in cosmetics.
   这种油是从植物中提取出来的，用于化妆品。
3. 3. The molecule has a unique structure that makes it useful in various applications.
   这种分子具有独特的结构，使其在各种应用中都有用。