sterol alkaloid

例句：

1. 1.Steroid hormones are important for maintaining a healthy weight.
   甾醇激素对于保持健康体重非常重要。
2. 2. The body produces sterols to protect itself from infections.
   身体产生甾醇来保护自己免受感染。
3. 3.Sterols are found in many plants and animals, including humans.
   甾醇存在于许多植物和动物中，包括人类。