Arkansas Third District comprised twenty-one counties in the northwest quadrant of the state and was one of Americas most rural congressional districts.

阿肯色州的第三选区由21个县组成，这些县占据了阿肯色州西北部1／4的面积，是美国国会所有选区中乡村最多的地区之一。

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Firstly, the research area is divided into three districts according to the physiognomy and the terrain: the northwest low mountainous area, north hilly area and northeast low mountainous area.

首先在空间上依据地形、地貌划分出三个区域：西北部低中山区、北部丘陵区和东北部低中山区。

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The arid irrigation districts, which are in the northwest of the country, take on a greater significance for the local human society.

地处西北的干旱灌区对当地人类社会的意义更加巨大。

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