topo beacon

例句：

1. 1. The topo beacon system is used to determine the location of ships in a harbor.
   顶标灯系统用于确定船只在港口的位置。
2. 2. The beacon on the mountain was used to guide the hikers back to the trail.
   山上的灯塔被用来引导徒步旅行者回到小径上。
3. 3. The signal from the beacon helped us find our way back to the campsite.
   灯塔的信号帮助我们找到了回营地的路。