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• Use “ “ for phrases o [ “pediatric abdominal pain” ] • Use – to remove results with certain terms o [ “abdominal pain” –pediatric ] • Use OR to account for alternate terms o [teenager OR adolescent ]
吞咽时，食物从口腔到达喉，又叫咽部（1）。上食管括约肌开放（2）食物进入食管，食管肌肉的收缩称为蠕动，推动食物向下运动，然后食物通过下食管括约肌（3）并进入胃。然后，食物经过膈肌 (4) 和食管下括约肌 (5) 进入胃。
