double tapph.doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double pipes heat exchanger套管式换热器double density distribution偶极密度分布double - object sentences双宾语结构Double circular-arc gears双圆弧齿轮double-shielded enclosure双屏蔽外壳double standard pitch auger双标准螺距螺旋double closed-loop system双闭环系统double crystal spectrograph双晶摄谱仪Double iron combined roller双金属复合辊筒double innominate osteotomy髋骨切骨术

1. 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。
2. 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。