马加雷夫消长模式；马加雷夫演替模式 Margalef's model of succession 林缘群落；边缘群落 marginal community 边缘分布 marginal distribution ..
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marginal urban community 边缘城市社区
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Second, scientific advance tends to have increasing returns to scale: adding more scientists to a community does not diminish individual marginal productivity but tends to increase it.
ECONOMIST: BY INVITATION: Helping the world’s poorest | The
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