1、Congenital——a birth defect that is not inherited
先天的缺點，并不是因為遺傳而獲得的特性。

2、Birth defect is one of the key elements that seriously affect the quality of population.
出生缺陷是影響人口出生質(zhì)量最重要的因素。

3、In the first group birth defect was found in 6 children. Total incidence rate amounts to 76%.
在孕期接觸氯乙烯組中發(fā)現(xiàn)先天性缺陷子女6人，總計發(fā)生率為76%。

4、Prenatal Screening can be helpful to lower birth defect and improve the quality of the new born.
產(chǎn)前篩查有助于降低缺陷兒出生，提高出生人口質(zhì)量。