Politzer's luminous cone

例句：

1. 1. The luminous cone was thecenterpiece of the exhibition.
   发光锥体是展览的中心。
2. 2. The luminous conewas used to illuminate the dark room.
   发光锥体被用来照亮黑暗的房间。
3. 3. Theluminous cone was a popular choicefor outdoor lighting.
   发光锥体是户外照明的热门选择。