问题描述：
Help me,对这段英文改下错,thank you!
However,without the right understanding the promotion of economic,social and cultural factors for the migrant flows,the formulation of policies as the basis for all kinds of restrictions are unlikely to be an effective inspection.At the international level,the need for along-term cooperation strategy in order to achieve common goals,to make immigrants as a positive factor of sustainable development,to prevent the conflict areas between emigrants and local residents;to contribute to positive social and cultural changes.The first half of the 20th century period,international migration has become a major factor for the world's various regions and development of social transformation.With the increase in the number of migration flows and new mobile way,its importance is bound to the 21st century and have to continue inevitably to increase.
是关于中国移民美国的一个总结
However,without the right understanding the promotion of economic,social and cultural factors for the migrant flows,the formulation of policies as the basis for all kinds of restrictions are unlikely to be an effective inspection.At the international level,the need for along-term cooperation strategy in order to achieve common goals,to make immigrants as a positive factor of sustainable development,to prevent the conflict areas between emigrants and local residents;to contribute to positive social and cultural changes.The first half of the 20th century period,international migration has become a major factor for the world's various regions and development of social transformation.With the increase in the number of migration flows and new mobile way,its importance is bound to the 21st century and have to continue inevitably to increase.
是关于中国移民美国的一个总结
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