平行线

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

将平行线置于锯齿形条纹背景上，左氏错觉会让平行线不平行。

Parallel lines are lines that never join.

平行线是永不相交线。

There are two parallel lines.

这有两条平行线。

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

按定义说, 平行线是在同一平面上永不相交线。

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

目前量算面积方法有方格纸法、平行线法、求积仪法。