bifocal

音标发音

Julia adjusted her invisible bifocal glasses and entered the classroom.
茱莉亚调整了一下自己的双光隐形眼镜。
He had beautiful skin, with rosy cheeks, blue eyes, rimless round bifocal spectacles, resting on the tip of his nose.
他皮肤很好，面颊红润，眼睛深蓝，鼻梁上架着一副无框双焦眼镜。
The entire arrangement makes it easy for this bifocal fish to spot a tasty bug flying above the water, or a bit of algae below.
这个构造使四眼鱼能够很轻松地发现一只从水面飞过的美味的虫子，或者水面下的一点水藻。

Benjamin Franklin: statesman, author, postmaster, inventor of the bifocal, the lending library and the Franklin stove.
FORBES: Magazine Article
In the 1780s, Benjamin Franklin invented the bifocal.
FORBES: Magazine Article