英语语法分析

Cameras feature a 3.3 - to 12-millimeter varifocal auto-iris lens.

这两款相机都能3.3 - 12毫米自动变焦光圈镜头。

The freely varifocal glasses is mainly used for the losing adjusting vision of the old.

该眼镜主要用于老年视力失去调节能力。

Disclosed is freely varifocal glasses, which comprises zoom lenses and a focusing device.

自由变焦眼镜，是由可变焦镜片和调焦装置构成。