lens disc

例句：

1. 1. The camera's lens is scratched and needs to be replaced.
   相机的镜头被刮伤了，需要更换。
2. 2.The scientist used a lens disc to study the sun's spectrum.
   科学家使用一个透镜片来研究太阳光谱。
3. 3. Lens discs are commonly used in microscopes to focus light onto a sample.
   透镜片在显微镜中常用来聚焦光线到样品上。