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。
Only in a flat universe does space obey all the standard geometry-class rules-the angles of a triangle add up to exactly 180 degrees and parallel lines never meet.
只有在平坦的宇宙中，空间才符合标准的几何规律——三角形的内角和精确地等于180度，平行线永远不相交。
Since rules inferring is faster than geometry computation and requires little time, the rules are of help to improve efficiency of querying spatial data.
由于规则推理比几何计算速度快、内存消耗小，因此推理能够提高基于空间关系的空间数据查询的速度和效率。
Generally, the proving of geometry theorem is based on the axiom system, and is deducted according to certain logic rules.
通常，几何定理的证明是依据公理系统，按一定的逻辑规则演绎地进行。
Second, the geometry models of the voting rules that have been used usually are tried to constitute, to optimize current voting rules by theoretic analyse.
第二，尝试建立常用投票规则的几何模型，通过理论分析来优化现有的投票规则。
No matter whether you use geometry, trigonometry or calculus, you use the simple rules of arithmetic.
无论你使用几何学，三角形学或者微积分法，你都。
No matter whether you use geometry, trigonometry or calculus, you use the simple rules of arithmetic.
无论你使用几何学，三角形学或者微积分法，你都。
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