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A级:这一级土地是平地或接近平地。其土层深厚呈黑色,一般是肥沃的,或在良好的经营情况下可能变得肥沃。这一类土壤往往是从粉砂到砂质不等的深厚冲积土,无侵蚀问题。
Grade A: This level of land is flat or near flat. Its deep, black soil is generally fertile or may become fertile in good business conditions. This type of soil is often a deep alluvial soil ranging from silt to sandy with no erosion problems.