bifocals是什么意思

bifocals

英 [baɪ'fəʊkəlz] 美 [,baɪ'foklz]

n. 远视近视两用的眼镜

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中文词源

bifocals 双光眼睛

前缀bi-, 二。词根foc, 焦点，见focus.

英文词源

bifocals (n.): "bifocal spectacles," 1899, see bifocal. Conceived by Benjamin Franklin, but called by him double spectacles.

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