lens retainer spring

例句：

1. 1. The camera has a large lens that allows it to capture detailed images.
   这台相机有一个大透镜，可以捕捉详细的图像。
2. 2. Lenses are used in cameras to focus light onto the film.
   透镜用于相机中聚焦光线到胶片上。
3. 3. The scientist used a special lens to observe the stars at night.
   这位科学家用一个特殊的透镜来观察夜晚的星星。