What does it mean, "In forward motion, any straight line drawn in the body remains parallel to itself."?

Answer from: Veilchen:

If you draw a segment (or a line) through any 2 points of a body, it will be carried parallel to itself as it moves.
In general, there is a definition. Progressive motion is the motion of a body in which the segment connecting any 2 points of the body is carried parallel to itself in the process of motion

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