bi·fo·cal /ˈbaɪˌfokəl/ (a.)雙焦點的
bi·fo·cal /(ˈ)baɪˈfokəl/ 形容詞 雙焦點的,複合眼鏡的,雙焦點眼鏡
bifocal 雙焦點透鏡
Bi·fo·cal a. Having two foci, as some spectacle lenses. ◄ ►
bifocal adj : having two foci; "bifocal eyeglasses"