资料来源 : pyDict

双焦点的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Bifocal \Bi*fo"cal\, a. [Pref. bi-+ focal.]
   Having two foci, as some spectacle lenses.

资料来源 : WordNet®

bifocal
     adj : having two foci; "bifocal eyeglasses"