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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 ]
卵巢每月都会向输卵管排放一次卵子。性交后，精子从阴道进入到输卵管，在输卵管里，精子可以使卵子受精。受精卵细胞在移动到子宫的过程中，继续分裂，并着床在子宫壁内。
