常見例句雙語例句Objectives: Gastroesophageal flap valve can be divided into a four-grade system and this system can well predict the prevalence of gastroesophageal reflux disease.研究動機：胃食道皮瓣可區(qū)分爲四級。而這種分類系統(tǒng)，可以預測胃食道逆流疾病的發(fā)生率。 返回 gastroesophageal flap valve