blackboard

n.黑板

black mark, black market, black mass, Black Muslim, black out, black pepper, Black Power, black pudding, Black Sash, black sheep, black spot, black tie, black widow, black-beetle, black-out, black-water, blackamoor, blackball, blackberry, blackbird, blackcurrant, blacken, blackened, blackguard, blackguardly, blackhead, blackjack, blacklead, blackleg, blacklist, blackmail, blackmailer, blackness, blackout, blackshirt, blacksmith, blackthorn, bladder, blade, blaeberry,