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Down's syndrome (DS) is an incurable, heritable disorder affecting an estimated 400,000 people in the U.
唐氏综合症是一种遗传的不治之症,在美国大约有40万患者。
youdao
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Down's syndrome (DS) is an incurable, heritable disorder affecting an estimated 400,000 people in the U.
唐氏综合症是一种遗传的不治之症,在美国大约有40万患者。
youdao