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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 ]
出现肾盂积水的肾脏会因尿流受阻而膨胀。尿液从梗阻部位开始向后积聚并留在肾小管以及中央集尿区域（肾盂）中。
