名词
中文翻译：Unknown
同义词：
['Down syndrome', 'trisomy 21']
例句：
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1.The child with Down syndrome has a unique facial appearance.
患有唐氏综合症的孩子有独特的面部特征。
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2. The research on Down syndrome is crucial for understanding the genetic basis of mental retardation.
对唐氏综合症的研究对于理解智力障碍的遗传基础至关重要。
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3.Many children with Down syndrome have learning disabilities and require special education services.
许多患有唐氏综合症的儿童有学习障碍，需要特殊教育服务。