正常的双螺旋DNA是螺旋形的，像一根松松地卷曲的弹簧。
Normal, double-helix DNA is spiral , like a loosely coiled spring.
它由一些金属板和金属棒构架而成，螺旋形的围裹在一个蒸馏架上，展示了那个知名的完整双螺旋旋转。每个金属片代表四个碱基之一。
It is constructed out of metal plates and rods, arranged helically around a retort stand, and shows one complete turn of the famous double helix.
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