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That's a cunning bird. Birds are different from animals. They can fly wherever they want. Birds soaring in the sky are a symbol of freedom, which always makes people want to look up. The old man was already old and too lazy to go out into the outside world. When he looked at birds again, he felt that birds were not easy and birds also had their limitations. For example, although birds can fly here and there, except for migratory birds such as swallows and geese, most birds are resident birds. Where to stay? It seems that you can choose whatever environment you live in, but that is not the case. Wherever the mother bird gave birth to it, its shadow remains. The sky is infinite, but its life circle is limited.