bifocal

音標發(fā)音

Julia adjusted her invisible bifocal glasses and entered the classroom.
茱莉亞調整了一下自己的雙光隱形眼鏡。
He had beautiful skin, with rosy cheeks, blue eyes, rimless round bifocal spectacles, resting on the tip of his nose.
他皮膚很好，面頰紅潤，眼睛深藍，鼻梁上架著一副無框雙焦眼鏡。
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.
這個構造使四眼魚能夠很輕松地發(fā)現(xiàn)一只從水面飛過的美味的蟲子，或者水面下的一點水藻。

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