presecretin

例句：

1. 1. The enzyme is responsible for breaking down the protein before it can be absorbed by the body.
   这个酶负责在蛋白质被吸收之前将其分解。
2. 2. Presecretin is a hormone that regulates blood sugar levels in the body.
   前肽是一种激素，调节体内的血糖水平。
3. 3. In order to prevent infection, doctors prescribe antibiotics before surgery.
   为了预防感染，医生在手术前开抗生素。