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。

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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。

youdao