The two streets run parallel to one another.
This line is parallel to that.
This line is parallel to the other.
The girl exercised on the parallel bars.
The river runs parallel to the main street.
The road is parallel to the river.
It has no parallel.
The parallel with English becomes even more striking when we realize that Latin continued to be used for many hundreds of years more as the world's first "international language."
The opposite sides of a square are parallel.
The railroad is parallel to the road.