change of arable land area 耕地面积的变化
Mongolia is the 18th largest country in the world by area. However, it has very little arable land: much of its area is grassland.
蒙古是18世纪世界上面积最大的国家，不过蒙古的可耕地面积非常少，大部分都是草地。
With an area of 379 square kilometers; 47 million mu of arable land, fertile soil of fertile land suitable for farming; good water quality, water-saving agriculture is universal.
面积379平方公里；耕地47万亩，均为沃土良田，适宜耕作；水质优良，节水农业正在普及。
The measurement of net arable land coefficient is of great importance in investigating the status of land-use, aiming at improving accuracy of the area survey.
净耕地系数测算是土地利用现状调查中一项极其重要的工作，其目的是提高耕地面积调查的精度。
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