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- 民工 (12)
- 研究 (11)
- 劳动就业 (6)
- migrant labor (3)
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- agricultural laborers (1)
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- government policy (1)
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- immigration enforcement (1)
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- political science / political freedom & security / civil rights (1)
- politics and government (1)
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- social aspects (1)
- social conditions (1)
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