crash helmet

hat made of very strong material (eg metal), worn by motor-cyclists, racing drivers, etc to protect the head （摩托车手、 赛车驾驶员等戴的）防撞头盔.

cramped, crampon, cranberry, crane, crane-fly, cranial, cranium, crank, crankshaft, cranky, crannied, cranny, crap, crape, crappy, craps, crapulence, crapulent, crash, crash barrier, crash-dive, crash-land, crash-landing, crass, crassly, crassness, crate, crater, crater lake, cravat, crave, craven, craving, crawfish, crawl, crawler, crayfish, crayon, craze, crazed,