Methods 104 samples of amniotic fluid from pregnant women during 16-29th-week gestation were cultured and karyotyped.
方法抽取104例孕16～29周孕妇的羊水，采用改良的羊水细胞培养方法进行培养。
In the last weeks of gestation he'll gain about half a pound a week.
在怀孕的最后几周里他差不多会每周增重半磅。
Studies using ultrasound have shown that fetuses exhibit REM sleep as early as the 23rd week of gestation.
研究者通过超声波发现，23周大的胎儿即开始在睡眠时快速移动眼球。
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