protoduodenum

例句：

1. 1. The protoduodenum is the first part of the small intestine that connects to the stomach.
   十二指肠是小肠的第一部分，它与胃相连。
2. 2. He was diagnosed with a condition affecting the protoduodenum.
   他被诊断出患有影响十二指肠的状况。
3. 3.The doctor advised him to eat more fiber-rich foods to improve his digestion and prevent bloating in the protoduodenum.
   医生建议他多吃富含纤维的食物来改善他的消化并防止在十二指肠的胀气。