as is known to all， migrant workers have made a great contribution to the prosperity of cities. they are an indispensable part of our workforce. most of them work on construction sites. there is no doubt that without migrant workers many of the construction projects would have to be held up for lack of manpower. in addition， a large number of migrant workers is a factor which stimulates the consumption of food and daily items. this helps to develop food industry and service trades in cities. all these are positive aspects of migrant workers in cities.

　　however， as a popular saying goes， "everything was two sides"。 the same is the case with migrant workers. first， they have trouble getting their children into child care centers and schools because they are unregistered residents in the city. as you know， illiterate people， who are usually ignorant of laws， tend to make trouble concerning law and order. second， most of the migrant workers swarm into big cities just to make money. being ignorant and incompetent， some of them would stop at nothing to get what they want. therefore， they are a potential threat to the peace and stability of the society.

　　in my opinion， in the appraisal of migrant workers， it is one-sided to affirm everything or to negate everything. we should appreciate the great contribution made by them， and at the same time pay enough attention to the problems caused by them.

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