purple signal lamp glass

例句：

1. 1.The purple signal lamp glass is a symbolof safety.
   紫色信号灯玻璃是安全的象征。
2. 2.The purple signal lamp glass was used inthe construction of the bridge.
   紫色信号灯玻璃用于桥梁的建设。
3. 3. The purple signal lamp glasswas carefully polished to ensure its clarity.
   紫色信号灯玻璃被仔细抛光，以确保其透明度。