Language is regarded as an ethnic and social marker, and also an important component of identity and culture for many groups.

语言是一个民族和社会的标记，也是许多群体身份与文化构成的一个重要方面。

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Government bond, which is an important component in the bond marker, is the main form of government credit.

国债作为公债的重要组成部分，是国家信用的主要形式。

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Objectives: To establish the technology for extracting cell-free fetal DNA in maternal plasma, comparing detection rate of fetal component marker SRY gene and RASSF1A gene.

工作目的：建立母血浆中胎儿游离dna分离提取的技术，利用SRY基因和RASSF1A基因检测胎儿游离dna，并比较它们的检出率。

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