plastic signal lens

例句：

1. 1.The plastic signal lamp lens is a crucial component in the traffic control system.
   塑料信号灯透镜是交通控制系统中的关键部件。
2. 2.The lens of the camera focuses on the subject, providing clear images.
   相机的透镜聚焦于主题，提供清晰的图像。
3. 3.The lens of the telescope can be adjusted to focus on different objects at different distances.
   望远镜的透镜可以调整以在不同距离上聚焦不同的对象。