Do you think the migrant workers' contributins to the city should be ignore?

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My answer is "No",although some of us living in a modern city don't like them,who think that they come from the poor areas and have poor education,they are the root of evils.In fact,we couldn't neglect their contributions to the society.We could not live in a modern building if without them;we could not drive our car proudly on the road if without them.Althoug they earn money less than us,i am strongly against the practice to judge persons' contribution depend on money that they earned.All the people who living in the world are equal.