以下为句子列表：
英文: Doctors present Peru's miracle babyto the public six months after surgery to separate her legs fused by a congenital defect known as mermaid syndrome.
中文: 在手术六个月后,医生们向公众介绍秘鲁奇迹婴儿.外科手术分开了她由于美人鱼综合症的先天性缺陷而连在一起的腿.
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英文: Prenatal diagnosisó refers to diagnosis of the fetus regarding its congenital defect and hereditary diseases.
中文: 产前诊断，是指对胎儿进行先天性缺陷和遗传性疾病的诊断。
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英文: Conclusion The serum AFP and free-β-HCG levels of pregnant women are more effective in screening trisome fetus than PAPP-A+free-β-HCG. The serum screening of Down′s syndrome would be a practical method of preventing the congenital defect of fetus.
中文: 论血清标记物AFP+freeβHCG筛查三体综合征较PAPPA+freeβHCG好,唐氏综合征血清筛查是预测不良妊娠结局的有效指标,再结合产前诊断对防止先天缺陷有实用价值。
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