To astronomers, flat means that the usual rules of geometry are observed - light travels in straight lines, not curves.
对于天文学家来说，平面的宇宙意味着几何学的一般原理将被遵守，光在直线中运行，而不是曲线。
Rules of geometry, cloth-covered backdrop and with soft lighting, highlights women's style and Roumei space atmosphere.
布满规则几何图形的绒布背景墙和以柔和的灯光，凸显出空间的女性风格与柔媚气氛。
You may only use elementary geometry, such as the fact that the angles of a triangle add up to 180 degrees and the basic congruent triangle rules (side-angle-side, etc.).
你可以使用初等的几何知识例如三角形的三个内角各为180度和三角形全等的规则(边-角-边等)。
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