Lin Qingxuan's "Flying South in Wild Goose" describes the huge body of wild geese for the sake of what? What do you want to tell people?

"One day, all the geese in Vancouver will not fly south, and migratory birds will become resident birds. In a few more generations, the descendants of the geese will lose the ability to fly long distances. In a few more generations, the descendants will not even know about flying south. "

The author wants to tell people:

As a friend who immigrated to Canada 17 years said, his situation is very similar to that of a goose. I'm afraid that my descendants don't know anything about flying south, so I often take my children to feed the geese and let them know that Vancouver is not our hometown, although it's good. My hometown is in the far south-my motherland! Express the feelings of a wanderer in a foreign country who misses his motherland. In an excellent foreign environment, the longer the time, the easier it is to forget the motherland in the far south. In the long run, future generations will forget "flying south".