固醇生素

例句：

1. 1.The body needs a certain amount of cholesterolto function properly.
   身体需要一定量的胆固醇来正常运作。
2. 2. Hormones are chemical messengers that regulate various bodily functions.
   激素是调节各种生理功能的化学信使。
3. 3.The study of hormones is crucial forunderstanding the human body's internal processes.
   研究激素对于理解人体内部过程至关重要。