所有生物的每个细胞内部都存在DNA分子链。

Inside every cell in all organisms, there are strands of DNA.

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这反过来促发损害细胞的反应链。

This, in turn, can start chain reactions that damage cells.

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这反过来促发损害细胞的反应链。

This, in turn, can start chain reactions that damage cells.

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