DNA是一种像螺旋阶梯样形状的双链分子。
DNA is a double stranded molecule shaped like a spiral staircase.
罗斯城堡：亲自来体验这颗镶嵌在凯瑞郡的明珠吧，会对它设置精妙的螺旋阶梯叹为观止。
Ross Castle: See the cunning spiral staircase at this County Kerry gem.
通过使用在二条里发现的特别旋转天线收集信息，二条形成螺旋状用它的四个阶梯固定在每条横断面上。
Information is collected through the use of special rotating antennae found on the two strands that form the helix and located where each strand intersects with its four ladders.
通过使用在二条里发现的特别旋转天线收集信息，二条形成螺旋状用它的四个阶梯固定在每条横断面上。
Information is collected through the use of special rotating antennae found on the two strands that form the helix and located where each strand intersects with its four ladders.
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