gastroscopy

例句：

1. 1. He underwent a gastroscopy to examine his stomach lining.
   他接受了一次胃镜检查来检查他的胃壁。
2. 2. The doctor advised him to undergo regular gastroscopies to monitor his health.
   医生建议他定期进行胃镜检查以监测他的健康状况。
3. 3. During the procedure, the doctor inserted a flexible tube into his esophagus for a gastroscopy.
   在手术过程中，医生将一根灵活的管子插入他的食道进行胃镜检查。