Objective To understand the current status of perinatal healthcare quality for the migrating population in Changing County and provide a basis for implementation of efficient countermeasures.

目的了解流动人口孕产妇围产期保健质量，为采取有效的干预措施提供依据。

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The history of peasants' migrating to cities was actually a changing history of the institution about the free migration and employment rights as well as other rights of the rural population.

新中国农民进城的历史实际上是一部国家关于农民自由迁徙权、自由择业权等众多进城权利的制度变动史。

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Moreover, as a result of China's efforts to move up the value chain in manufacturing so as to cope with its aging population, lower-cost manufacturing is migrating from China's coastal areas inland but also to countries such as Vietnam, Indonesia and Bangladesh.

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Puerto Ricans have been migrating to the United States since the 1800s, but it wasn't until World War II that this population movement peaked.

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