The structures are made from bundles of double-helix DNA strands.
这些结构是由一束束双螺旋DNA链构成。
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He'd also provided Watson, without Franklin's knowledge, with her key photograph, which showed — for the first time — the double-helix shape that underlies the structure of DNA.
From a distance, these building blocks look very similar, so every piece of DNA you look at has the same overall shape—the famous Watson-Crick DoubleHelix.
从远处看，这些基本成分看上去极为相似，因此 DNA 的每一部分的基本形状都是相同的 — 著名的沃森克里克双螺旋结构。