Word
bifocals
双光眼镜
eyeglasses having two focal lengths, one for near vision and the other for far vision
- 1.
Spectacles that have corrective lenses of two different powers; used by people who need both distance and reading glasses.
具有两种不同度数矫正镜片的眼镜；用于需要远用和近用镜片的人。
具有两种不同度数矫正镜片的眼镜；用于需要远用和近用镜片的人。
In use
My grandfather wears bifocals to read and to see the road clearly.
After turning forty, she realized she needed bifocals for both close work and distance vision.
The optician adjusted the bifocals so they would sit comfortably on his nose.
a pair of bifocals
bifocals 是复数形式名词，不能用 a bifocal 表示单数。
He needs a new pair of bifocals.
他需要一副新的双光眼镜。
wear bifocals
My aunt wears bifocals for both reading and driving.
我姑姑戴着双光眼镜，既用来看书也用来开车。
adjust to bifocals
adjust to 后接名词，表示“适应……”。
It took me a few weeks to adjust to bifocals.
我花了几周时间才适应双光眼镜。
Common mistakes
I need a new bifocal.I need new bifocals.
bifocals（双光眼镜）是复数名词，像 glasses 一样，表示一副眼镜时也要用复数形式，不能用单数 bifocal 表示整副眼镜；中文没有复数标记，所以容易漏掉 -s。改成 bifocals 后名词与所指一致。
My bifocals is broken.My bifocals are broken.
bifocals 形式上是复数，谓语动词要用 are，不能用 is；尽管中文说“我的双光眼镜坏了”不区分单复数，但英语中主语是复数名词，动词必须保持数的一致。
Connections
Collocations
- wear bifocals
- 戴双光眼镜
- My grandfather has worn bifocals for years.我祖父戴双光眼镜已经很多年了。
- a pair of bifocals
- 一副双光眼镜
- She bought a new pair of bifocals at the optician's.她在眼镜店买了一副新的双光眼镜。
- prescription bifocals
- 验光配制的双光眼镜
- These prescription bifocals are designed for both reading and distance.这副验光配制的双光眼镜是为阅读和远视两用设计的。
- reading bifocals
- 阅读用双光眼镜
- He uses reading bifocals at his desk.他在办公桌前使用阅读用双光眼镜。
Synonyms
- dual-focus lenses
- 双焦点镜片 · 与 bifocals 最接近的正式说法，强调镜片有两个固定焦点；通常指镜片而非整副眼镜，常见于光学或技术语境。
Learner notes
Memory Tip
bifocals 拆成 bi（两）+ focal（焦点）：镜片上有远、近两个焦点，看远看近都清楚。
Context & Register
语域：neutral 常见场景：配眼镜时、谈论视力问题 该词为日常通用说法，多用于配镜或视力相关话题，正式程度适中，无需特别口语化或书面化。
Pronunciation & Spelling
trifocals、vocals、locals、yokels 与 bifocals 押韵：它们的重读元音及之后的部分都含 /oʊkəlz/ 音（注意拼写分别是 -focals、-cals、-kels）。bicycles 是易混词：虽然也以 bi- 开头、以 -cles 结尾，但重音在第一个音节，读作 /ˈbaɪsɪkəlz/，与 bifocals 不押韵。
Dictionary facts from ECDICT, WIKTIONARY.