这条路与渥太华河平行。

The road runs parallel to the Ottawa River.

平行线永不相交。

Parallel lines never meet.

将平行线置于锯齿形条纹的背景上，策尔纳幻觉会让这些平行线看似形成分岔。

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

两条经线在赤道平行而在两极趋于相交。

A pair of lines of longitude are parallel at the equator but converge toward the poles.

与道路平行的一条大型水泥排水沟。

A big concrete gutter that paralleled the road.