您要查找的是不是：
- a biconcave lens 双凹面透镜
- a biconcave lens. 凹面镜
- This lens can magnify 20 diameter. 这个透镜能放大20倍。
- biconcave lens 双凹面透镜,双凹透镜
- Some adjustment of the lens may be necessary. 可能有必要调节一下镜头。
- Do you have soft contact lens care product? 有没有软性隐型眼镜保养用品？
- He uses lens to make things appear clearer. 他用镜片以便看东西更清楚些。
- The lens is often used to make telescopes. 镜片常被用来做成望远镜。
- Don't smear the lens; I've just polished it. 别把镜头弄脏了，我刚刚擦过。
- The camera lens must be screened from direct sunlight. 照相机的镜头不可受到阳光的直射。
- Concave on both surfaces;biconcave. 双面均凹进的；
- A close- up lens is ideal for taking close- up picture. 近摄镜用来拍特写照片最理想。
- In this operation the surgeons implant a new lens (in the eye). 医生在这次手术中给病人(眼球)植入了新的水晶体。
- The gunsight has an infrared lens for night vision. 射击瞄准器装有用于夜间视力的红外线镜头。
- Just as a double convex lens enlarges, so a double concave lens reduces. 正象双凸透镜可以放大那样，双凹透镜也可以缩小。
- The lens hood is used to cover up the lens. 遮光罩是用来遮盖镜头的。
- The lens of the eye accommodate to distance. 眼球晶状体能根据距离进行调节。
- I prefer a built-in zoom lens, like the one I have. 我喜欢如我所有的那种固定式变焦镜头。
- In most mammals mature erythrocytes are biconcave disks that have no nuclei. 在多数哺乳动物中，成熟红细胞呈双凹面盘样，无细胞核。
- He focuses the lens of a microscope. 他调整显微镜的透镜以定焦点。
