Backyard
来自Big Physics
Old English gerd (in yard1 (sense 2)), of West Germanic origin; related to Dutch gard ‘twig, rod’ and German Gerte .
wiktionary
back + yard
etymonline
backyard (n.)
also back-yard, "plot of ground at the rear of a house," 1650s (perhaps early 15c.), from back (adj.) + yard (n.1).
