These two dialogues, it should be evident, I mean, differ not only in content but in their dramatic context.

这两本语录，很明显地，不只是内容不同,其戏剧性的脉络更是不同。

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If I'm talking about two DNA strands and they differ only in one or two base pairs they won't be exact complements and they won't form this double helix.

假设有两条DNA单链,有一两个碱基不能配对,它们就不能完全互补,也无法形成双螺旋形结构

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