“双螺旋”造句

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.

这就是双螺旋.
This is the double helix.

由此产生的双螺旋结构减少了摩擦,并允许更快, 更容易系带.
The resulting double helix reduces friction and allows faster, easier lacing.

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