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- agriculture (2)
- economic aspects (2)
- economic policy (2)
- agricultural productivity (1)
- economic development (1)
- economics (1)
- equilibrium (economics) (1)
- human capital (1)
- natural resources (1)
- research (1)
- 报酬递增 (1)
- 教育经济学 (1)
- 研究 (1)
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