bad

a.坏的；有害的；严重的

backstroke, backtrack, backup, backward, backward(s), backwardness, backwards, backwards (also backward), backwash, backwater, backwoods, backwoodsman, backyard, bacon, bacteria, bacterial, bactericidal, bacteriologist, bacteriology, bacterium, bad debt, bad lands, bad language, bad-mouth, bad-tempered, baddy, bade, badge, badger, badinage, badly, badminton, badness, baffle, bafflement, baffling, BAFTA, bag, bagatelle, bagel,