pregnenolone

例句：

1. 1.The hormone plays a crucial role in regulating menstruation and pregnancy.
   这种激素在调节月经和怀孕方面起着至关重要的作用。
2. 2.Pregnenolone is an important precursor for the synthesis of estrogens.
   孕烯醇酮是雌激素合成的重要前体。
3. 3. In some studies, pregnenolone has been shown to have anti-cancer properties.
   在一些研究中，孕烯醇酮已被证明具有抗癌症性质。