农用地是一个复杂的自然、生态和社会复合体；农用地的价值由农用地的自然质量价值和无形价值构成。
Arable land is complicated systems that consist of nature, ecology, society, and its value is composed of its natural quality value and invisible value.
农用地是一个十分复杂的自然、生态和社会复合体，是人类赖以生存的源泉。
Arable land is complicated systems that consist of nature, ecology, society, and it is the source to exist for mankind.
农业复合生态系统是具有特定功能的复合体，如何全面地分析和评价农业复合生态系统，目前仍是困扰生态系统研究的难题。
Agricultural complex system has the special functions and how to comprehensively analyse and evaluate it is till the problem of ecosystem research.
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