That can happen but that's abnormal, but changes in maybe the chemistry of the backbone that holds the nucleotides together.

这可能发生的,但属于非正常的变化,而是改变诸如维持核苷酸序列的,主链的化学结构

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It's phosphate, carbon, carbon, carbon, phosphate, carbon, carbon, carbon, phosphate and it has this structure hanging off the side.

就是磷酸基与戊糖的碳反复连接,如此循环往复,这种结构构成了主链的一边

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In fact, the majority of languages, more languages, are actually subject-object-verb languages.

事实上,大多数语言,更多的语言,都是主宾谓结构的语言

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So, English is what's known as a subject-verb-object language.

英语是所谓的主谓宾结构的语言

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There's a subject, verb, object.

这是主谓宾结构

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The backbone's on the outside of the molecule like the upright struts of a ladder on the outside of a ladder.

主链位于DNA分子结构外侧,像梯子两侧上下的支柱,记住是梯子外侧

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