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Lens
鏡片
Do you wear glasses?
你戴眼鏡嗎？
How about contact lenses?
隱形眼鏡呢？
Do you know what the similarities between glasses and contact lenses are?
你知道眼鏡和隱形眼鏡的相同之處有哪些嗎？
They help you see objects better.
它們幫助你更好地看清物體。
How can they do that?
它們是怎樣做到的？
Glasses and contact lenses improve your eyesight, because both of them use some kind of lens.
眼鏡和隱形眼鏡之所以能改善你的視力，是因為它們都使用某種鏡片。
Generally, there are two kinds of lenses.
一般來說，鏡片有兩種。
One kind of lens makes you see things bigger.
一種鏡片能放大物體。
These kinds of lenses are used for magnifying glasses or glasses for old people.
這種鏡片用來做放大鏡或老花鏡。
Another kind of lens makes you see things smaller.
另一種鏡片能縮小物體。
These are used for usual glasses.
這些鏡片用來做普通的眼鏡。