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1. What is more troublesome than the increase in the number of immigrants is how to gather them and make good plans.

Nearly 80% of them live in underdeveloped countries. Many of these countries cannot afford the current population.

3. The centers of population saturation, mainly distributed in Asia and Latin America, will gradually become areas of social unrest. In the urban agglomeration, more and more young citizens will get a good education and hope to live a better life.

The solution of urban problems, like rural areas, depends largely on ourselves.

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