易混淆的单词： Trisomy

Nasal bone assessment in prenatal screening for trisomy 21 .

鼻骨分析在产前21三体筛查中的作用。

Most pregnancies will result in miscarriage . While there are some that will survive to term , over 99 % of live born babies with trisomy 13 will die within the first week .

大部分孕妇在怀孕的过程中最后会流产，有一些胎儿能够存活到生产的时候，但是超过99%的13三体综合症的胎儿会在出生后一周内死亡。