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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 ]
鼻窦是鼻周附近骨头内的空腔。两个额窦就位于眉毛上方。两个上颌窦位于颧骨中。两组筛窦位于鼻腔两侧。两个蝶窦（未显示）位于筛窦后侧。
