平行线

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

将平置于锯齿形条纹背景上，左氏错觉会让平看起来不平。

Parallel lines are lines that never join.

平是永不相交的。

There are two parallel lines.

这有两条平。

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

, 平是在同一平面上永不相交的。

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

目前常用的量算面积方法有方格纸法、平法、求积仪法。