We are like two parallel lines that never face up to each other.
我门像是两条平行线永远不能坦白面对面。
The most sad love, not like two parallel lines, but as distantly faces like two crossover, who know each other again after a long journey, gradually.
最可悲的爱情，并不是像两条平行线一样遥遥相望，而是像两条交叉线，相知后又渐渐远行。
A two-dimensional model of such a universe would look like a sphere. It's impossible to have parallel geodesics (straight lines on a curved surface) — the two lines will cross at some point.
这样的2维宇宙模型就像是球体，不可能出现平行的测地线(测地线是曲面上的直线)——两直线必然在某点相交。
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