Borderline

来自Big Physics
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wiktionary

ref 

border +‎  line


etymonline

ref

borderline (n.)

also border-line, 1847, "strip of land along a frontier," from border (n.) + line (n.). As an adjective meaning "verging on" it is attested from 1903, originally in medical jargon.

取自“https://www.bigphysics.org/index.php?title=Borderline&oldid=35625”