农业是在大自然中进行的；大自然里的生态系统中各种生物和活动相互影响，而粮食的生产正是处在这样的生态环境中。
Agriculture takes place in nature, among ecosystems of interacting organisms and activity, and crop production takes place within that ecosystem environment.
分析了城市生态系统的功能，讨论了城市生态环境评价的概念和内涵。
The function of city ecosystem is analyzed, and the conception about urban ecological environment evaluation is discussed.
湿地是生态环境的重要组成部分，与森林、海洋一起并称为三大生态系统。
The marsh is an important part of the ecological environment which is called one of three ecological systems, (The other two are forest and sea).
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