The diversity and cause of man-earth system are the basic content of man-earth relationship.
人地系统的差异及成因是人地关系研究的基本内容，不发达地区的人地系统差异存在着其独特性。
The diversity and cause of man-earth system are the basic content of man-earth relationship. The man-earth system of developing region has its characteristic.
人地系统的差异及成因是人地关系研究的基本内容，不发达地区的人地系统差异存在着其独特性。
The relationship between man and the earth shows its non-symmetrical and non-linear characteristics.
人地关系是非线性、 非对称的关系；
The relationship between man and the earth shows its non-symmetrical and non-linear characteristics.
人地关系是非线性、 非对称的关系；
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