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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 ]
永存动脉干发生在胎儿发育过程中,发育中的动脉干未能分成肺动脉和主动脉,导致仅一根大血管离开心脏。结果是,含氧血液(氧合血液)和不含氧的血液(脱氧血液)混在一起进入人体和肺部。