内容主要说明：理想是人生导航的灯塔，我们每个人都应该有自己的理想。
Ideal is the beacon life navigation , we every person should have his own ideal .
遗憾的是，现在有了卫星导航技术，好多灯塔根本就用不上了。
The sad truth is that satellite navigation has made many lighthouses surplus to requirements .
导航灯塔