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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 ]
在妊娠晚期,胎儿移动至适于分娩的胎位。正常的胎位是胎儿颜面部朝后(朝向母体背部)、面部和躯体偏向一侧、颈部弯曲,先露部是头。
异常胎位是胎儿颜面部朝前,异常胎先露是面先露、额先露、臀先露和肩先露。