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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 ]
翼状胬肉是巩膜上的良性结膜病变（在这里显示为三角形白色赘生物），可扩散到角膜，会影响视力。
Paul Whitten/科学图片库
