胃食管括约肌
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Frequent heartburn or acid reflux are symptoms of a condition called GERD, or gastroesophageal reflux disease, which occurs when a sphincter muscle in the lower esophagus stops working properly.
WSJ: New Surgical Option for Heartburn
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。