S 链是双义的，大约3.4 kb 大小。

The S strand is ambisense and approximately 3.4 kb in size.

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这是链间耦合对共轭聚合物中双激子的反向极化作用。

It's the effect of interchain coupling on the inversed polarization of a biexciton in conjugated polymers.

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铁路（公司）也因技术改进而受益，例如双垛轨道车，而且有更好的软件管理全部机车和供应链。

Railways have benefited from such technological improvements as double-stacked rail cars and better software for managing both rolling stock and supply chains.

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But they will do that in a very particular way, in that only strands that exactly match will be able to reform their native structure.

但是双链的形成也不是随意的,只有完全互补的单链之间,才成重新恢复到它们原先的结构

耶鲁公开课 - 生物医学工程探索课程节选

They're colored different here to indicate one new difference that you know about now, and that's that there is an orientation, there's an up and down on the chain.

这里被涂成不同的颜色,来表示另一个不同之处,它是有方向的,表示双链一条向上,一条向下

耶鲁公开课 - 生物医学工程探索课程节选

This notion of complementary strands is very important.

这个双链互补配对的概念非常重要

耶鲁公开课 - 生物医学工程探索课程节选