bifocal

adj (esp of lenses in spectacles) designed for looking at both distant and close objects （尤指眼镜的镜片）远近两用的.

bicameral, bicarb, bicarbonate, bicarbonate of soda, bicentenary, bicentennial, bicker, bicycle, bicycle-clip, bicyclist, bid, biddable, bidder, bidding, bide, bidet, biennial, biennially, bier, biff, 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, bigamously, bigamy, bight, bigness,