In fact, the original meaning of the word blueprint is the design drawing before the building, because there was no copier before, and it was very troublesome to make several copies of the design drawing. Someone thought of a way: put the original picture on paper containing silver sulfate, and then dry it in the sun, because the original picture of the chemical reaction will be copied into a blue picture. This process is called printing, and accordingly the architectural design drawing is called blueprint, which is compared to planning and planning.
It was originally an architectural design. British people name blueprints according to their appearance, and when we translate them, we also translate them directly into blueprints.
But the design of Britain is also called blueprint, and the description of grand blueprint is also called blueprint. This is a word.
We call architectural design drawings design drawings, and blueprints are specially used to describe future planning.