hormones of digestive tract

例句：

1. 1.The digestive system is responsible for breaking down food.
   消化系统负责分解食物。
2. 2. The digestive enzymes are necessary for the body to break down nutrients.
   消化酶对于身体分解营养物质是必要的。
3. 3. A healthy diet is essential for maintaining a healthy digestive system.
   健康的饮食对于保持健康的消化系统至关重要。