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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 ]
大部分麦粒肿位于眼睑外缘（外），如此处下眼睑图所示。麦粒肿会肿胀、发红、发炎，中间呈淡黄色。
CHRIS HALE 博士/科学图片库
