1. A womanof independent means 
   靠个人收入生活的女子
2. process with independent increment 
   独立增量过程
3. A section of double railroad tracks formed by the temporary convergence of two parallel tracks in such a way that each set remains independent while traversing the same ground, affording passage at a narrow place without need of switching. 
   套式铁轨一段铁路轨道，其中两股道由于两条平行轨道暂时会聚而重叠，并使得每一股轨道都各有一根钢轨位于另一股轨道的两根钢轨之间，使得在狭窄的地方不需要换轨
4. deoxyribonucleic acid double helix 
   脱氧核糖核酸双螺旋
5. Do a double take 
   惊奇地再看一眼；突然明白了意思

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• 1. 孤双链
  independent double bonds 孤双链...independent double linkages 孤双链...independent drive 单独激励; 独立驱动
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