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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 ]
为了取出液体样本，医生会在下脊柱的两块骨头之间插入一根中空的小针。液体送到实验室检测。
