目的超声骨密度仪测定妊娠中晚期孕妇跟骨骨密度。
Objective To determine the calcaneum bone density of pregnant women's in meta late-phase with ultrasonic bone density apparatus.
目的评价肝素对改善妊娠中晚期脐动脉收缩期最大血流速度（S）与舒张末期血流速度（D）的比值异常的临床效果。
ObjectiveTo evaluate the efficiency of heparin on the ratio of peak systolic to least diastolic flow velocity (S/D) of umbilical artery flow velocity waveforms at second-trimester pregnancies.
目的：怀孕的糖尿病妇女比怀孕的正常妇女更容易患先兆子痫，其患病风险率大约高出4 - 12倍，先兆子痫是妊娠中晚期的严重的急性并发症。
Objective: pregnancies in diabetic women are at 4-12 more risk for pre-eclampsia, an urgent, acute onset complication of mid to late gestation, than pregnancies in normal women.
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