N a system of growing crops in arid or semiarid regions without artificial irrigation, by reducing evaporation and by special methods of tillage 旱作农业
Dry farming ,irrigation farming,and the cattle and sheep herding are the main cativities of the Great Plains of the American West.
旱地农业，灌溉农业和牛羊牧业是美国西部大平原地区的主要活动。
Dry farming, irrigation farming, and the cattle and sheep herding are the main activities of the Great Plains of the American West.
旱地农业，灌溉农业和牛羊牧业是美国西部大平原地区的主要活动。
Dry farming irrigation farming and the cattle and sheep herding are the main activities of the great plains of the american west.
旱地农业，灌溉农业和牛羊牧业是美国西部大平原地区的主要活动。
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