Parallel lines are lines that never join.

是永不相交。

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

按照定义说, 是在同一面上永不相交。

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

将置于锯齿形条纹背景上，左氏错觉会看起来不。

There are two parallel lines.

这有两条。

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.

摘要构建了一个纬表象为于赤道直，表象为对称于中央直双曲，且面积没有变形投影集合，并得到一组概括公式。