单词trisomy-21-syndrome
Down syndrome (trisomy 21) is a disorder caused by the presence of an extra 21st chromosome.
唐氏综合症（21三体综合症）是由于患者额外多了一条21号染色体所致的疾病。
Down"s syndrome or trisomy 21 occurs in around 1 in 800 births and older women are at higher risk.
唐氏综合症又称21三体综合症，发生率大约在八百分之一，产妇年龄越大，发病率越高。
Rapid detected of trisomy 21 syndrome by gene diagnosis techniques
快速检测21三体综合征基因诊断方法的研究
The use of the primed in situ labeling technique in the diagnosis of 21-trisomy syndrome
引物原位标记技术在21-三体综合征诊断中的应用