Parallel lines are lines that never join.

平行是永不相。

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

按照定义说, 平行是在同平面上永不相。

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

将平行置于锯齿形条纹背景上，左氏错觉会平行看起来不平行。

There are two parallel lines.

这有两条平行。

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.

摘要构个纬表象为平行于赤道直，经表象为对称于中央直经双曲，且面积没有变形投影集合，并得到组概括公式。