形容詞 bifocal:

1. having two foci

bi.fo.cal

adj.（形容詞）
Having two focal lengths.
雙焦距的
Having one section that corrects for distant vision and another that corrects for near vision, as an eyeglass lens.
雙光的：一個矯正遠(yuǎn)視而另一個矯正近視的，如眼鏡
Embodying two distinct and often conflicting goals, interests, or courses of action:
包含兩個不同的并且經(jīng)常是矛盾的目的、興趣或一系列行為：
例句：
.a smoothly functioning bifocal mind.(John McPhee).A bifocal monetary policy . . . has kept one eye on the money supply and the other on interest rates.(Edward Meadows)
.順利進(jìn)展著的兩種想法.(約翰·麥克菲).雙軌財政政策…一面著眼于資金供給，另一方面著眼于利率.(愛德華·梅多斯)

pl.n.（復(fù)數(shù)名詞）
bifocals
Eyeglasses with bifocal lenses.
雙光眼鏡

【引伸】
bifo.calism
n.（名詞）