基本遗传物质dna的缺陷造成癌症发生。
Canceris caused by defects in DNA, the basic genetic material.
告诉你的健康顾问，你的家庭病史，遗传缺陷，生育不足。
Talk to you health care provider about your family history, genetics and birth defects.
唐氏综合症是最常见的引发智力缺陷的遗传因素。
Down syndrome is the most common genetic cause of mental retardation.
唐氏综合症是最常见的引发智力缺陷的遗传因素。
Down syndrome is the most common genetic cause of mental retardation.
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