It's a twisted ladder and there's a couple of things to notice about this familiar structure.
它犹如扭曲的梯子,对于这众所周知的结构有几件事必须注意
One is that there are two backbones right here in the light blue, so this would be the upright parts of the ladder that are twisted.
其一是浅蓝色所代表的两条主链,这是构成,扭曲梯子的垂直部分
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