Blueprint

来自Big Physics
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wiktionary

ref 

blue +‎  print


etymonline

ref

blueprint (n.)

also blue-print, 1882, from blue (adj.1) + print (n.). The process uses blue on white, or white on blue. Figurative sense of "detailed plan" is attested from 1926. As a verb by 1939.

取自“https://www.bigphysics.org/index.php?title=Blueprint&oldid=26891”