七边形是在一个平面上有七个边。
七边形的装置将简单的屋顶平台变成了一个户外空间，将人们的视线集中于天空。
The heptagonal structure transforms the simple roof terrace into an outdoor room that focuses visitors' attention to the sky above.
结果表明，拓扑缺陷五边形和七边形在碳管中沿轴向的不同分布对碳管电学性能的影响明显不同。
The results show that the different arrangements of pentagons and heptagons along the axis cause obvious differences on the electrical properties of the carbon nanotube.
组成冬季六边形的这六颗星是毕宿五、五车二、北河二(和北河三)、南河三、参宿七和天狼星。
The six stars that compose the Winter Hexagon are Aldebaren, Capella, Castor (and Pollux), Procyon, Rigel, and Sirius.
七年级数学要学的东西确实挺难：比例、小数、平行四边形的面积。
The kinds of things you need to learn in seventh grade math, sure, they're hard: ratios, decimals, the area of a parallelogram.
一凸多边形有七条边，但只有一个角是直角。
A particular convex polygon with seven sides has exactly one right Angle.
一凸多边形有七条边，但只有一个角是直角。
A particular convex polygon with seven sides has exactly one right Angle.
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