这些结构是由一束束双螺旋DNA链构成。
The structures are made from bundles of double-helix DNA strands.
从螺旋锥束数据来重建图像有许多优点，但是这种成像方式在数学上比较复杂，技术实现也有相当的难度。
Image reconstruction from spiral cone-beam data is practically advantageous, but it is mathematically complicated and technically challenging.
但一束光线也可以由与其它不同步的光波组成，这样波峰的排列就形成了螺旋状。
But a beam can also be made of waves that are out of sync with one another, in just such a way that the arrangement of the peaks is a spiral.
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