Main compositions: double strands quaternary amine salt, solubilizing agent, softener and natural antibacterial essential oil.

主成份：新型无毒抗菌剂双链季胺盐、增溶剂、柔软剂、天然抗菌芳香精油。

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RNA molecules form double stranded helices, just as do DNA molecules, by Watson Crick pairing of nucleotides on the two complementary strands of the helix.

RNA分子能像DNA分子那样形成双链螺旋，通过沃森·克里克配对，两个螺旋的核苷链互补。

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Structurally, DNA is composed of two strands that intertwine to form a spring-like structure called the double helix.

从结构上讲，DNA是由两条链相互缠绕构成弹簧状结构称为双螺旋。

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That tells you something about the physical chemistry of the molecule; that it's these hydrogen bonds that hold the double strands and I can break those down under certain conditions.

我们从中可以知道一些,DNA分子的理化特点,双链是由氢键连接在一起,在一定条件下这些氢键可以断裂

耶鲁公开课 - 生物医学工程探索课程节选

Those are two continuous strands that wind around each other to form the double helix.

这两股主链,相互缠绕形成双螺旋

耶鲁公开课 - 生物医学工程探索课程节选

This is - what this diagram shows you is-- the forces that hold these individual strands of DNA into a double stranded form.

你们可以看看这个图表,演示了连接两条DNA长链为双螺旋,结构的化学力

耶鲁公开课 - 生物医学工程探索课程节选

Antisense drugs are named after one of DNA's two strands in its double-helix structure, which are known as sense and antisense.

FORBES: Antisense and Sensibility

The orbits flown by the satellites are ever so slightly offset, which means they trace paths across the sky that look like the strands of a double helix.

BBC: German radar satellites fly tight space waltz

Red and white industrial rope light strands will grace the Canadian arch portion of the bridge, while red, white, and blue strands will grace the U.S. double-arch portion of the bridge.

FORBES: Soo Bridge Celebrates 50 Years, Ambassador Bridge Fights, and the Mighty Mac Separates