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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 ]
检眼镜是医生用于检查患者眼睛内部的一种工具。检眼镜有一个折射镜,多个不同度数的透镜和一个光源。医生利用检眼镜可看到视网膜、视神经、视网膜静脉及动脉以及可能影响玻璃体的各种异常。