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rural disease
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rural disease
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理学
乡村病
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rural disease
乡村病
在乡村转型发展过程中,由于乡村发展系统内部各子系统之间,以及乡村发展系统与周围环境之间的互动关系失衡、结构失调,造成乡村发展受阻甚至乡村地域系统衰退的经济社会过程。
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orthogonal substates
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orthogonal sum
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