The pressure of human activities to the physical geographical system in central urban area must be reduced during urbanization or re-urbanization.

在城市化和再城市化过程中，应大幅度减小中心城区自然地理系统所承受的高强度人类活动压力。

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Ecosystem: organization of the biological community and the physical environment in a specific geographical area.

UNESCO: L O S S A R Y