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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 ]
内镜是一根弯曲自如的管子，可用于消化道各个部位的检查。经口送入（如左图所示）的内镜用来检查食管、胃及部分小肠。经肛门送入（右图）的内镜用来检查直肠和整条大肠。
