Parallel lines are lines that never join.

平行线是永不相交的线。

Parallel lines are, by definition, lines on the same plane that never join.

按照定义说, 平行线是在同一平面上永不相交的线。

Zollner's illusion makes parallel lines seem to diverge by placing them on a zigzag-striped background.

将平行线置于纹背景上，左氏错觉会平行线看起来不平行。

There are two parallel lines.

这有平行线。

An equalarea pseudo cylindrical projection gather is constructed, in which the longitudes are hyperbola being symmetrical to the central meridian and the latitudes are parallel lines.

摘要构建了一个纬线表象为平行于赤道的直线，经线表象为对称于中央直经线的双曲线，且面积没有变的投影集合，并得到一组概括公式。