As a result of the different position of prestressing strands, the structure system has multiform space shape, such as barrel vault, hypar and dome.
通过改变预应力索在网架中的位置，可张拉得到不同的曲面形状，如柱面、穹顶和鞍形网壳。
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。
This time, instead of using charred paper, he took several strands of cotton, twisted these together into the shape of hairpin, and charred, or carbonized, this filament in an oven.
这回他不用烧焦的纸，而代之以几股棉线。他把几股棉线搓在一起，呈发夹状，然后把已搓成的灯丝放在炉内烧焦，也就是使之碳化。
This time, instead of using charred paper, he took several strands of cotton, twisted these together into the shape of hairpin, and charred, or carbonized, this filament in an oven.
这回他不用烧焦的纸，而代之以几股棉线。他把几股棉线搓在一起，呈发夹状，然后把已搓成的灯丝放在炉内烧焦，也就是使之碳化。
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