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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 ]
医生使用窥镜（一种金属或塑料工具）将阴道壁分开。然后插入一个小塑料刷，从子宫颈（子宫下部）采集样本进行测试。
