复式双焦点透镜的英文

• double bifocal lens

• 复式:    compound; multiple; double
• 双焦点透镜:    bifocal
• 双焦点透镜:    bifocal lens; lens, bifocal
• 单块双焦点透镜:    one-piece bifocal lens
• 单中心双焦点透镜:    monocentric bifocal lens