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石质山、丘陵区治理坡耕地,修筑石坎水平梯田是保持水土的一项重要措施。梯田每亩需要的土方量和石方量的计算公式是:
Stony hills, hilly areas slope farmland, stone ridge level terrace is to maintain water and soil is an important measure. The amount of earthwork and stonework that terraces require per acre is: