随着细胞的老化和复制，它们的端粒不断地缩短。

As cells age and replicate, their telomeres shorten.

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首先本文对引文网络形成的两个主要机制(节点老化机制和边复制机制)进行建模。

Firstly this thesis proposes APA Model for the two major mechanisms of citation network, which are node aging mechanism and edge copying mechanism.

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目的探讨皮肤光老化与真皮成纤维细胞线粒体DNA复制控制区点突变的关系。

Objective to investigate the relationships between skin photoaging and point mutations in mitochondrial DNA (mtDNA) control region for replication of dermal fibroblast.

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目的探讨皮肤光老化与真皮成纤维细胞线粒体DNA复制控制区点突变的关系。

Objective to investigate the relationships between skin photoaging and point mutations in mitochondrial DNA (mtDNA) control region for replication of dermal fibroblast.

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