eyeglasses having two focal lengths, one for near vision and the other for far vision
例句
Nowadays, these glasses are known as bifocals. 如今，这些眼镜被称作双光眼镜。
Nowadiscussions, trapse aloudes calm unhappy as bifocals. 如今，这被称为双光眼镜。
They were bifocals which he had invented so that he could see objects both near and far. 这是他发明的远近两用眼镜,戴上它,无论远处近处的东西都能看清楚。
I’m thankful that women my age will need bifocals to see the chin hairs that they missed plucking. 我对象我这般年纪的妇女需要双光眼镜才能看清下巴上漏拔的毛发而表示感谢。
After a quick google search, I found out the shop is still running and he's still wrenching away with his bifocals on. 今天古狗了一把之后发现，车店还在老地方，杰瑞仍然戴着老花眼睛坚守在修理架旁边！
No history of spectacles would be complete without some mention of Benjamin Franklin, who invented bifocals in the 1780s. 不提到本杰明富兰克林，眼镜的历史不会完整，他在1780年发明了远近两用的眼镜。
