ethinyloestradiol

例句：

1. 1. Ethinyl estradiol is a synthetic estrogen that has been used in hormone replacement therapy.
   雌二醇是一种合成的雌激素，已在激素替代疗法中使用。
2. 2. The study found that estrogen levels were higher in women than men.
   研究发现，女性的雌激素水平比男性高。
3. 3. Ethinyl estradiol is often used to treat conditions such as osteoporosis and breast cancer.
   雌二醇常用于治疗骨质疏松症和乳腺癌等疾病。