The effects of policy on natural resources environment can be imposed by its effects on agricultural activities.
政策对自然资源环境的影响主要是通过对农业生产活动的作用来实现的；
Knowledge of people - environment systems in natural, agricultural urban, and industrial landscapes.
认识自然，农业，城巿及工业景现内的人—环境系统。
This paper discusses basic character and transmutation of Yunnan's agricultural natural environment system safeguarding agricultural activities against natural calamity.
论述了保障云南省农业生产安全的农业自然环境系统的基本特征及其变迁。
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