bifocals

名词 n.
中文释义

英文释义

名词 n.
  1. Spectacles that have corrective lenses of two different powers; used by people who need both distance and reading glasses. plural,plural-only
    — He unfolded a pair of bifocals and thrust them as far up the bridge of his nose as possible.

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.
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