But all 300 of them have one thing in common: they are children of migrant workers who have come to Beijing in search of a better life.

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This hits the children of migrant workers.

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Some migrant children are particularly difficult to reach, especially the children of migrant agricultural workers who tend to be highly mobile.

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Texans Ruben , Daniel and David Perez , the sons of migrant farm workers, worked in the fields as children.

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