结论：FS可作为估计孕周、判定胎儿-胎盘单位功能的一项生化指标。
Conclusion: The FS can be used as a biochemical index for estimating gestational weeks and evaluate feto-placental unit function.
结论：FS可作为估计孕周、判定胎儿-胎盘单位功能的一项生化指标。
Conclusion: The FS can be used as a biochemical index for estimating gestational weeks and evaluate feto-placental unit function.
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