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.
但不幸的是，氧实际上是有毒的生物分子和细胞。
Except that unfortunately, oxygen is actually toxic to biological molecules and cells.
但不幸的是，氧实际上是有毒的生物分子和细胞。
Except that unfortunately, oxygen is actually toxic to biological molecules and cells.
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