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noun
一. a transparent optical device used to converge or diverge transmitted light and to form images
Synonym: lenselens system
二. electronic equipment that uses a magnetic or electric field in order to focus a beam of electrons
Synonym: electron lens
三. biconvex transparent body situated behind the iris in the eye
its role (along with the cornea) is to focuses light on the retina
Synonym: crystalline lenslens of the eye
四. (metaphor) a channel through which something can be seen or understood
e.g. the writer is the lens through which history can be seen
一. 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.
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。
二. （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.
三. see also: contact lens;telephoto lens;wide-angle lens;zoom lens
一.
一. 晶状体：一.晶状体 晶状体(lens)是一个具有弹性的双凸透明体,主要由上皮细胞构成. 晶状体外包薄层均质的晶状体囊(lens capsule),由增厚的基膜及胶原原纤维组成. 晶状体内无血管和神经,营养由房水供给. 老年人晶状体的弹性减弱,
二. 水晶体：眼球前段是聚光的部份,是由眼角膜(cornea) ,瞳孔 (pupil) ,水晶体 (lens)及玻璃体所组成. 它们的功能是调节及聚合外界入射的光线. 光线首先穿过眼角膜這片透明薄膜,经由瞳孔及水晶体,将光线屈曲及聚合在眼球的后段.
三.
三. lens：laser engineering net shaping; 激光近成形lens
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