bifocals

n. 双光眼镜

词形变化

only 复数

释义与例句

n.
  1. 1.

    Spectacles that have corrective lenses of two different powers; used by people who need both distance and reading glasses.

    双光眼镜

    仅复数

词汇关系

名词

上位词 4

glasses specs spectacles eyeglasses

词源

From bi- + focal (see focus), coined in 1824 by John Isaac Hawkins, inventor of trifocals. When the concept of bifocals was originally conceived by Benjamin Franklin, he called them double spectacles.

来源：wiktionary