oestrone

例句：

1. 1. Oestradiol is a hormone that plays a crucial role in the menstrual cycle.
   雌二醇是一种在月经周期中发挥关键作用的激素。
2. 2.The study found that estrogen levels in women were significantly higher than those in men.
   研究发现，女性的雌激素水平显著高于男性。
3. 3.Oestradiol therapy has been shown to improve fertility and reduce the risk of breast cancer.
   研究表明，雌二醇治疗可以提高生育能力并降低乳腺癌的风险。