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。
As one of the main hydrological factors of the water cycle, river runoff is affected by human activities, watershed climate and geographical factors, and its change is a non-linear dynamical system.
河川径流作为水循环水文要素之一，由于受人类活动、流域气候及自然地理等因素的综合影响，其变化呈一个非线性动力系统。
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