biennial

a.两年一次的

bibliographical, bibliography, bibliophile, bibulous, bicameral, bicarb, bicarbonate, bicarbonate of soda, bicentenary, bicentennial, bicker, bicycle, bicycle-clip, bicyclist, bid, biddable, bidder, bidding, bide, bidet, biennially, bier, biff, bifocal, bifocals, bifurcate, bifurcation, big, big bang hypothetical, Big Brother, big business, big dipper, big end, big game, big top, big wheel, big-head, big-hearted, bigamist, bigamous,