An affine transformation is one in which parallel lines remain parallel after the transformation.

仿射转换指的是平行线在转换后还保持平行。

youdao

Man and woman are two parallel lines, and it is the nature of parallel lines never to meet.

男人与女人是两条平行线。两条平行线是不会相交的。

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I thought I could do was hold hands all the way down, but came to realize that a free hand in all but two parallel lines, when all away, still parallel to the parallel.

曾经以为可以这样牵着手一路走下去，可是放手了才明白一切只是两条平行线，当一切都烟消云散，平行的依旧平行。

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These lines,or circles,are parallel -- meaning that they are equally distant from each other at any point around the world.

VOA: special.2010.07.14

He scores the plate in parallel lines with the blowtorch, which heats the metal.

CNN: ASIANOW - TIME Asia | GizmoLand! | Man Beats Machine

M. tracing a star between two parallel lines, when he could see his drawing hand only in a mirror.

ECONOMIST: H.M.

At Smyrna, for instance, different body styles start out on parallel lines and are then brought together for painting and final assembly.

FORBES: Magazine Article