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

耶鲁公开课 - 生物医学工程探索课程节选

They were colored the same, the backbones were colored the same in the diagram.

但颜色是一样的,在示意图这些主链的颜色是一样的

耶鲁公开课 - 生物医学工程探索课程节选

We had Gopher and St. Louis, Missouri, has a school named Washington University, which was one of the first backbones for the Internet.

我们有Gopher查询系统，而且密苏里州的圣路易斯，有所华盛顿大学，它是网络的第一批支柱之一。

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That there are two colors per strut, so what's linking the two backbones together are two colored segments that come from the outside towards the middle, and that the colors occur only in certain combinations, red and green, yellow and blue, that's all you see.

每个梯阶有两个颜色,主链是由,两种不同颜色的片段由外向内连接起来的,这些颜色仅以某种特定方式配对,红连接绿,黄连接蓝,大家都能看到

耶鲁公开课 - 生物医学工程探索课程节选