The concepts of complementary cofactor pairs, normal double-graphs and feasible torn vertex sets are introduced.

引入了互补余因式对、正规双图和可行撕裂点集的概念。

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Moreover, the extreme shape of the normal double circle gearing proves to be the involved curve of the corresponding ellipse.

并且证明，法面双圆弧齿轮的每一段端面齿廓都是对应椭圆曲线段在相对运动中的包络曲线。

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Normal, double-helix DNA is spiral , like a loosely coiled spring.

正常的双螺旋DNA是螺旋形的，像一根松松地卷曲的弹簧。

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It's not in my current folder but because I installed it with like a normal installer, double click and all of that.

它并不在我当前文件夹，但是由于我安装了,某个程序，双击的那种，然后一切都搞定。

哈佛公开课 - 计算机科学课程节选

If you examine the formation on the daily chart, the two lows are three months apart, which is fairly normal for double-bottom formations.

FORBES: A Chart Formation the Pros Love

He gave the example of using an interpreter which often made appointments take double the normal time.

BBC: Blunkett plays down 'swamping' remark

Double the normal average amount of rain for June fell last month, and April was the wettest since records began more than a century ago.

BBC: Hosepipe bans: Final four companies lift restrictions