平行线

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, 平行是在同一平面上永不相。

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，左氏觉会让平行看起来不平行。

Graph paper, parallel, and planimeter methods are current tools for acreage calculation.

目前常用面积方法有方格纸法、平行法、求积仪法。

There are two parallel lines.

这有两条平行。