为了改善北盘江流域的生态环境质量，有必要对石漠化过程和人类活动方式采取适当的调控措施。
It is necessary to take suitable measures to control the process of rock desertification and to adjust human's activities in order to improve the environmental quality.
从古城址的时空分布格局、选址条件、人类活动方式等出发，阐述了六胡州古城址的环境指示意义。
At last, this paper discussed some environmental indication of these abandoned castles by analyzing their time-space distribution, environmental condition and possible human activities around.
原则上，有三种方式限制人类活动对环境的影响：通过人口政策，技术和管理。
In principle, there are three ways of limiting human environmental impacts: through population policy, technology and governance.
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