lighthouse tube

例句：

1. 1. The lighthouse tubeis a crucial part of the navigation system.
   灯塔管是导航系统的关键部分。
2. 2. Thelighthouse tube was used to signal dangerto ships at sea.
   灯塔管被用来向海上的船只发出危险信号。
3. 3. Thelighthouse tube was replaced by a moremodern technology.
   灯塔管被更现代的技术所取代。