Copy the document (so as not to damage the original).

复制一个文档副本(以使原始文件不被损害)。

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In eggs, mitochondria have only one copy of this DNA, making them vulnerable to damage as women age.

卵细胞中线粒体的DNA只有一个副本，随着女性的年龄增长，他们极易受到伤害。

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In eggs, mitochondria have only one copy of this DNA, making them vulnerable to damage as women age.

卵细胞中线粒体的DNA只有一个副本，随着女性的年龄增长，他们极易受到伤害。

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