bifocals是什么意思？

bifocals

英[ˌbaɪˈfəʊklz] 美[ˌbaɪˈfoʊklz]

• n. 双重焦点透镜，双光眼镜( bifocal的名词复数 )；

形容词：bifocal;

柯林斯高阶英汉双解学习词典释义

• N-PLURAL
  双光眼镜；远近两用眼镜
  Bifocals are glasses with lenses made in two halves. The top part is for looking at things some distance away, and the bottom part is for reading and looking at things that are close.
  例句
  Mrs Bierce wears thick bifocal lenses. 比耶尔斯太太戴着厚厚的双光眼镜。