lens

He took off his spectacles and rubbed frantically at the lens.

他摘下眼镜慌乱地擦镜片。

Your camcorder should have these basic features: autofocus, playback facility, zoom lens.

你的便携式摄像机应该具有这些基本特征：自动调焦、回放及变焦镜头。

It costs 200 dollars although you may well want to spend more—perhaps as much as another 200 dollars—on buying additional lenses and other equipment.

它的成本是200美元，尽管你可能想花更多的钱——也许是再花200美元——来购买更多的镜头和其他设备。

Opacity of the eye lens can be induced by deficiency of certain vitamins.

眼球晶状体的混浊可由缺乏某些维生素引起。

Connected to a wave-front sensor that tracks and measures the course of a laser beam into the eye and back, the aluminum mirror detects the deficiencies of the cornea, the transparent protective layer covering the lens of the human eye.

铝镜与一个波前传感器相连，它可以跟踪和测量进入眼睛和眼睛后部的激光束的路径。铝镜可以检测角膜，即覆盖在人眼晶状体上的透明保护层的缺陷。

Have you got your lenses in?

你戴了隐形眼镜吗？

At night, the lenses have an even greater potential.

在晚上，这种隐形眼镜甚至有更大的潜力。