平行线

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，左氏错觉会让平行来不平行。

Parallel lines are lines that never join.

平行是永不相交。

There are two parallel lines.

这有两条平行。

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

按定义说, 平行是在同一平面上永不相交。

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

目前常算面积方法有方格纸法、平行法、求积仪法。