| 词汇 | trisomy 21 |
| 释义 | trisomy 21 noun [ U ] medical specialized (also Trisomy 21) uk/ˌtrɪ.sə.mi twen.tiˈwʌn/ us/ˌtraɪ.soʊ.mi twen.t̬iˈwʌn/ （最常见的唐氏综合征、因多出一条21号染色体而引起的）21三体 the most common form of Down's syndrome (= a genetic condition associated with learning difficulties in which a person is born with an extra chromosome) that is caused by there being an extra copy of chromosome number 21 in the body's cells Their first child has trisomy 21 and they want to know the risk of having another child with Down's syndrome. 他们的第一个孩子有21三体，因此他们想知道第二个孩子得唐氏综合征的风险有多少。 Pregnant women can have their blood tested for Trisomy 21, a chromosomal abnormality.
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