平行线

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

目前常用的量算积方法有方格纸法、行线法、求积仪法。

Parallel lines are lines that never join.

行线是不相交的线。

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

按照定义说, 行线是在同不相交的线。

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

将行线置于锯齿形条纹背景，左氏错觉会让行线看起来不行。

There are two parallel lines.

这有两条行线。