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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 ]
为直接查看气道，医生会将一个软性支气管镜穿过患者的鼻孔或进入口腔，然后向下进入气道。圆圈图显示医师镜下所见的图像。
