rust

n.锈 v.生锈；(脑子)衰退

rupture, rural, rural dean, rural delivery, Ruritanian, ruse, rush, rush hour, rush into, rush out, rush sb. to..., rush through, rush-hour, rushy, rusk, russet, Russia, Russian, Russian roulette, Russo-, rust-proof, rustic, rustically, rusticate, rustication, rusticity, rustily, rustiness, rustle, rustler, rustling, rusty, rut, rutabaga, ruthless, ruthlessly, ruthlessness, rye, S, S, s,