Noun:

1. a pair of parallel helices intertwined about a common axis;

   "the shape of the DNA molecule is a double helix"
   

double yin重阴doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份Double Boiled Lamb Soup清炖羊肉double homoclinic orbit双同宿轨double-reduction gear复式减速齿轮double layer perovskite双层钙钛矿double-spot technique双光点技术double component system双组分系统double warp flannelette双经彩色条子棉法兰绒double connection check重接核对double glass transition双玻璃化转变double-well molecules双势阱分子

1. That is what a double helix looks like.
   这就是二重螺旋线的形状。
2. Each step of the double helix is a base made up of two kinds of nucleic acid.
   每阶二重螺旋线都是一个碱基，由两种核酸组成。
3. It provided strong evidence of the structure of D-N-A as a double helix.
   它为脱氧核糖核酸结构呈双螺旋线提供了有力证据。
4. Many of the databases along the double helix were shut down, closed, so that you began to function with very little data.
   许多数据库是顺着双螺旋线停止运行，关闭，让你们开始运行很少的数据。