英汉词典

1. 透镜；镜片
    A lens is a thin curved piece of glass or plastic used in things such as cameras, telescopes, and pairs of glasses. You look through a lens in order to make things look larger, smaller, or clearer.

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    e.g. ...a camera lens...
           照相机镜头
    e.g. I packed your sunglasses with the green lenses.
           我把你那副绿色镜片的太阳镜装好了。

2. （眼球的）晶状体
    In your eye, the lens is the part behind the pupil that focuses light and helps you to see clearly.

3. see also: contact lens;telephoto lens;wide-angle lens;zoom lens