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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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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