（照相机、望远镜等的）镜头由两片或更多的透镜组成的联合体，有些还要加上其它的光学仪器，如棱镜，用来成像以便观看或摄影。

（照相机、望远镜等的）镜头由两片或更多的透镜组成的联合体，有些还要加上其它的光学仪器，如棱镜，用来成像以便观看或摄影。的英文翻译

基本释义

• A combination of two or more such pieces,sometimes with other optical devices such as prisms,used to form an image for viewing or photographing.