The structure of DNA, consisting of two DNA strands that join together and form a helical shape.
DNA的一种结构，由两条链组成，两条链结合在一起产生螺旋形。
As you have already noticed, the polypropylene tubing comes in a helical shape that is unusable for our needs.
正如您已经注意到，聚丙烯管材采用的是螺旋形状，是需要我们无法使用。
Helical rotor is the most important part of rotor flow meter, and its section shape is normally formed by involute and cycloid.
螺旋转子是转子流量仪表中的心脏零部件，其截面形状一般由渐开线和摆线组合而成。
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