来自《耶鲁大学开放课程：生物医学工程探索 第3集 第3集》
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carbon, carbon, carbon, phosphate如此循环往复 -
and it has this structure hanging off the side.这种结构构成了主链的一边 -
Now DNA is a double helixDNA是双螺旋 -
and I've only shown you one part of the helix,我只是给你们讲了螺旋的一边 -
right? I've shown you one我给你们演示 -
upright strut and a base hanging off of it,一条链的支柱及碱基团 -
but it forms a double helix但其能构成双螺旋 -
because complementary strands of DNA strongly是因为DNA是完全互补的两条链 -
associate with one another彼此之间结合紧密 -
and that's a very stable structure.结构异常稳定 -
They do that它们结构稳定 -
because the bases can是因为碱基之间