bi·fo·cal [baɪˈfəʊkəl, 美 ˈbaɪˌfoʊ-] 形 不变的
- bifocal
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- bifocal spectacles
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PONS词典中的例句（已经编辑处理）
- bifocal spectacles
单语范例（未经PONS编辑处理）
Insects with compound eyes have a different perceptual apparatus than bifocal vision creatures like humans do, and their manner of perceiving the world is very different from our own.
www.theatlantic.com Historically, the only corrective option was wearing bifocals that allow for close viewing, as well as far-viewing capabilities when you look up from the bifocal area.
www.therecord.com This makes it bulge a little in the middle, creating a slight bifocal effect.
www.dailymail.co.uk This created a giant bifocal system which allowed him to see the blackboard through the right side, then use the left side to write down what he had seen.
en.wikipedia.org And so like a bifocal, you can only see in two different distances, distance and near.
www.npr.org