pyloric ring

例句：

1. 1.The patient's stomach was examined to determine the cause of his nausea and vomiting.
   患者被检查以确定他恶心和呕吐的原因。
2. 2. The surgeon performed a pyloric ring resection to relieve the patient's symptoms.
   外科医生进行了幽门环切除术以缓解患者的病状。
3. 3. The pyloric ring is an important structure in the digestive system that regulates the flow of food and gastric juices.
   幽门环是消化系统中的一个重要结构，它调节食物和胃液的流动。